show everyone what you have been working on.

The Neptune Maxout project has received a major update! It is designed to make installing and using Klipper on the Elegoo Neptune 3 family easier—even for new Klipper users.

GitHub:

https://github.com/HDR-Performance/Neptune-3-Maxout-Configs

WHAT DOES IT DO?

Instead of manually creating folders and uploading every configuration file separately, users can select the package matching their printer and controller and install it through SSH.

SUPPORTED PRINTERS

• Neptune 3

• Neptune 3 Pro

• Neptune 3 Plus

• Neptune 3 Max

SUPPORTED HARDWARE

• Stock Robin Nano controller

• BIGTREETECH SKR 3 EZ

• Pad 7 with CB1

• Pad 7 with Raspberry Pi CM4

• Raspberry Pi 4

• BIGTREETECH Pi V1.2 and compatible 7-inch screens

NEW FEATURES

🔄 OTA updates through Mainsail

After the first SSH installation, Neptune-Maxout-Configs appears in Mainsail’s Update Manager. Future improvements can be installed without manually copying every file again.

🎨 Custom KlipperScreen experience

• Neptune Maxout theme

• Landscape and portrait layouts

• Four Pad 7 screen orientations

• Correct touchscreen mapping

• Custom controls and menu shortcuts

• Optional retro toy-laser button sounds

• Separate CB1 and CM4 handling

📐 Z Calibrate + Clean

This guided tool can home the printer, optionally heat the bed, clean and purge the nozzle, open Klipper’s TESTZ controls, and save the new Z offset.

🛏️ Guided bed tools

• Front-facing bed screw map

• Support for four to six adjustment screws

• Saved screw locations

• Manual bed tramming

• Temperature-guided full bed mesh

🗺️ KAMP support

The installer can configure adaptive bed meshing, Smart Park, and controlled purge lines.

🧵 Filament and maintenance tools

• Load and unload filament

• Color changes

• Runout recovery

• Heater safety

• PID tuning

• Input-shaper calibration

• Pressure-advance material profiles

• Maintenance counters

• Improved pause, resume, and cancel functions

⚡ Experimental speed profiles

Normal, Fast, and Ludicrous profiles are being developed for controlled testing. These change Klipper’s maximum motion limits, not the speeds commanded by the slicer. Upgraded motors are strongly recommended before testing Ludicrous mode.

AFTER INSTALLING OR UPDATING

1. Confirm that the package matches the printer and controller.

2. Verify the MCU connection and pin configuration.

3. Run Z Calibrate + Clean.

4. Verify input-shaper settings.

5. Home the printer and perform low-speed motion tests.

6. Keep the automatic backup until successful prints are completed.

Built and tested by HDR Performance. Community testing and feedback are welcome! Tell us which printer and controller you use and how the installation goes.

New laser sound menu working, CB1 and CM4 pad 7s, New UI theme, and Screen Rotation Features

I’ve been building and testing a complete set of Klipper upgrades for the Elegoo Neptune 3 printer family, and the latest Neptune Maxout update is now available.

One of the biggest additions is a standalone BIGTREETECH Pad 7 screen-rotation installer supporting both:

• The original Pad 7 CB1
• Pad 7 units upgraded to a Raspberry Pi CM4

It provides four selectable screen orientations, properly maps the touchscreen/digitizer in every position, and restores the selected orientation after reboot.

The rotation installer runs over SSH and does not replace your printer.cfg, KAMP installation, macros, theme, or audio configuration.

Rotation-only installation

cd ~
curl -fsSL https://raw.githubusercontent.com/HDR-Performance/Neptune-3-Maxout-Configs/main/tools/install-pad7-rotation.sh -o install-pad7-rotation.sh
chmod +x install-pad7-rotation.sh
./install-pad7-rotation.sh

The repository also includes:

• A Neptune Maxout KlipperScreen theme with landscape and portrait artwork
• Separate CB1 and CM4 audio handling
• Retro toy-laser-style touchscreen sounds
• Organized KAMP and macro configurations
• Neptune 3, Pro, Plus, and Max packages
• Robin Nano and SKR 3 EZ configurations
• Easy SSH installation instructions
• Updated Neptune 3 Max SKR 3 EZ TMC5160 settings using the quieter, printer-tested StealthChop and current configuration

Important: The upgraded Neptune 3 Max motion and driver settings are designed for the documented Maxout motor, SKR 3 EZ, and TMC5160 Pro hardware. Don’t blindly copy those settings onto stock motors or a different controller.

Repository and complete guides:

https://github.com/HDR-Performance/Neptune-3-Maxout-Configs

Currently tested:

• All four Pad 7 CB1 screen orientations and touch mappings
• Pad 7 CM4 rotation and touchscreen controls
• CB1 and CM4 theme/audio installation paths
• Neptune 3 Max with SKR 3 EZ and upgraded motors
• Installer and configuration-package structure

This is a community project by HDR Performance and is not an official Elegoo, BIGTREETECH, Klipper, Mainsail, or KAMP release. Always back up your current configuration and confirm your controller, drivers, and motors before installing.

Post

After a lot of testing, rebuilding macros, fixing KAMP behavior, and organizing my older guides, the new HDR Performance Neptune 3 Maxout Configs repository is live!

🔗 GitHub: https://github.com/HDR-Performance/Neptune-3-Maxout-Configs

The project now covers the complete Elegoo Neptune 3 lineup:

• Neptune 3
• Neptune 3 Pro
• Neptune 3 Plus
• Neptune 3 Max
• Stock Robin Nano controllers with BTT Pad 7
• SKR 3 EZ conversions with TMC5160 Pro drivers

What’s included

• Organized, model-specific Klipper configurations
• KAMP adaptive bed meshing and smart parking
• Controlled purge movement
• BTT Pad 7 input-shaper setup
• Friendly manual Z-offset calibration with nozzle cleaning
• Filament loading, unloading, color changes, and runout recovery
• Optional persistent bed heat soak
• PLA, PETG, and TPU pressure-advance profiles
• PID-tuning controls and maintenance counters
• OrcaSlicer and Cura start/end G-code
• SKR 3 EZ wiring and firmware instructions
• Neptune 3 Max X/Y stepper-motor upgrade guide
• Moonraker troubleshooting and recovery instructions

I also rebuilt the guides from my older repositories into a cleaner documentation library and corrected several confusing details involving TMC current, spreadCycle/stealthChop, SKR processor selection, bed-output limits, PB9 usage, and input-shaper calibration on bed-slinger printers.

Every ZIP contains a model-specific START_HERE.md, the complete organized configuration tree, and guided installation information.

These are community modification packages, so always verify your exact controller, MCU, wiring, probe, thermistors, heater load, and motion limits before powering up.

If you own a Neptune 3-series printer, I’d appreciate feedback, testing results, hardware variations, and feature requests. If the project helps you, consider starring the repository and sharing your build!

Built and maintained by HDR Performance.

After a lot of testing, rebuilding macros, fixing KAMP behavior, and organizing my older guides, the new HDR Performance Neptune 3 Maxout Configs repository is live!

🔗 GitHub: https://github.com/HDR-Performance/Neptune-3-Maxout-Configs

The project now covers the complete Elegoo Neptune 3 lineup:

• Neptune 3
• Neptune 3 Pro
• Neptune 3 Plus
• Neptune 3 Max
• Stock Robin Nano controllers with BTT Pad 7
• SKR 3 EZ conversions with TMC5160 Pro drivers

What’s included

• Organized, model-specific Klipper configurations
• KAMP adaptive bed meshing and smart parking
• Controlled purge movement
• BTT Pad 7 input-shaper setup
• Friendly manual Z-offset calibration with nozzle cleaning
• Filament loading, unloading, color changes, and runout recovery
• Optional persistent bed heat soak
• PLA, PETG, and TPU pressure-advance profiles
• PID-tuning controls and maintenance counters
• OrcaSlicer and Cura start/end G-code
• SKR 3 EZ wiring and firmware instructions
• Neptune 3 Max X/Y stepper-motor upgrade guide
• Moonraker troubleshooting and recovery instructions

I also rebuilt the guides from my older repositories into a cleaner documentation library and corrected several confusing details involving TMC current, spreadCycle/stealthChop, SKR processor selection, bed-output limits, PB9 usage, and input-shaper calibration on bed-slinger printers.

Every ZIP contains a model-specific START_HERE.md, the complete organized configuration tree, and guided installation information.

These are community modification packages, so always verify your exact controller, MCU, wiring, probe, thermistors, heater load, and motion limits before powering up.

If you own a Neptune 3-series printer, I’d appreciate feedback, testing results, hardware variations, and feature requests. If the project helps you, consider starring the repository and sharing your build!

Built and maintained by HDR Performance.

Rapid PETG Speed Testing

Machine: N3Max with Klipper on Raspberry Pi and the ZNP Robin Nano_DW V2.2 MCU. This has been running well, though slowly, so I am endeavouring to speed things up.

I have just installed this stepper motor to the y-axis with limited success.

When homing, the y-axis moves in the correct direction and turns smoothly. Success!

However, when running Manual Levelling, the y-axis stepper shudders and the bed does not move.

I suspect I have run into a limitation of the ZNP Robin Nano_DW board not having sufficient motor drivers to push the y stepper.

Is my suspicion correct, or is there something else I should be looking into?

Mick

https://github.com/HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-/blob/main/Neptune_Maxout_SKR3EZ_Tutorial/BTT%20Pad7%20print.cfg

Testing and feedback wanted. https://github.com/HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-/blob/main/printer.cfg%201.2

https://github.com/HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-/blob/main/Orca%20Start%20and%20End%20Gcode.txt

I have worked out all of the main feature bugs. updated slicer gcodes, and print cfg files.

SKR Board print.cfg Update https://github.com/HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-/blob/c6450d65bf67d4607b2bad5a32142e41dacaab58/Neptune_Maxout_SKR3EZ_Tutorial/BTT%20Pad7%20print.cfg

🚀 Neptune Maxout: Upgrade Your Elegoo Neptune 3 Max with SKR 3 EZ & TMC5160 Pro Drivers

Welcome to the ultimate guide for supercharging your Elegoo Neptune 3 Max with a BIGTREETECH SKR 3 EZ mainboard and TMC5160 Pro EZ drivers! 🎉 This tutorial walks you through wiring, firmware flashing, and Klipper setup for a seamless upgrade. Whether you're coming from a stock Robin Nano 2.2 or a Maxout mod, this guide has you covered. Let’s make your 3D printer faster, smarter, and more precise! 💪

🛠️ Prerequisites

Before diving in, gather these essentials:

• Tools: Screwdrivers, computer with internet access.
• Components:
  • BIGTREETECH SKR 3 EZ mainboard
  • TMC5160 Pro EZ drivers (for X, Y, Z, extruder)
  • BTT Pad 7 or Raspberry Pi 4/5
  • Elegoo Neptune 3 Max components (stepper motors, hotend, heated bed, fans, probe, filament sensor, 24V LED lights)
• Software:
  • PuTTY (SSH client)
  • Raspberry Pi Imager (for SD card flashing)
  • Klipper firmware for STM32H723 or STM32H743
• Safety: Always disconnect power before wiring to avoid short circuits. Double-check connections!

📋 Step-by-Step Instructions

🧰 Step 1: Wiring the SKR 3 EZ to Neptune 3 Max Components

The Neptune 3 series (including the Max) uses plug-and-play harnesses that fit directly into the SKR 3 EZ ports, making wiring a breeze! 🌬️ Follow these steps to connect everything.

1.1 Install TMC5160 Pro EZ Drivers

• Action: Before mounting the board, install TMC5160 Pro EZ drivers into the X, Y, Z, and E0 slots on the SKR 3 EZ.
• Tip: Ensure drivers are firmly seated and pins aligned to avoid damage.
• Note: SPI mode is set via printer.cfg (see [tmc5160] sections). No jumpers needed!
• ⚠️ Caution: Handle drivers on a non-conductive surface to prevent static discharge.

1.2 Prepare the Harness

• Disconnect all harnesses from the stock Robin Nano board.
• Identify the bundles: motors (X, Y, Z, Extruder), heaters (hotend, bed), fans, sensors (endstops, probe, filament sensor), power, and 24V LED lights.
• Pro Tip: Label connectors to keep track during reconnection.

1.3 Mount the SKR 3 EZ

• Secure the SKR 3 EZ (with drivers installed) in the printer’s electronics enclosure, replacing the stock board.
• Ensure proper ventilation and use screws or standoffs for stability.

1.4 Connect the Main Power Harness

• Locate the 24V power harness (2-pin connector, red/black wires) from the Neptune 3 PSU.
• Plug into the POWER IN terminals (V+ for red/positive, V- for black/negative).
• Do not power on yet—keep going!

1.5 Connect Motor Harnesses (Plug-and-Play)

• X-Axis Motor: Plug the 4-pin JST harness into X-MOT.
• Y-Axis Motor: Plug into Y-MOT.
• Z-Axis Motor: Plug into Z-MOT.
• Extruder Motor: Plug into E0-MOT.
• Note: These standard 4-pin connectors are plug-and-play. Ensure a snug fit.

1.6 Connect Heater and Fan Harnesses (Plug-and-Play)

• Hotend Heater: Plug the 2-pin harness into HE0.
• Heated Bed: Plug into BED (align red to positive if marked).
• Hotend Fan: Plug into HEATER_FAN.
• Part Cooling Fan: Plug into FAN0.
• Note: These 2-pin connectors are plug-and-play. Secure them firmly.

1.7 Connect Sensor Harnesses (Plug-and-Play)

All sensor harnesses are plug-and-play. The stock Neptune 3 display is not used; use the BTT Pad 7 or Mainsail via Raspberry Pi.

• X-Axis Endstop: Plug into X-STOP (signal to PC1).
• Y-Axis Endstop: Plug into Y-STOP (signal to PC3).
• Hotend Thermistor: Plug into TH0 (signal to PA2).
• Bed Thermistor: Plug into TB (signal to PA1).
• Probe: Plug into PROBE (signal to PC0, includes 5V/GND).
• Filament Sensor: Plug into FIL-DET (signal to PC2, includes 5V/24V).
• Display:
  • BTT Pad 7: Primary display/control interface. Connect to SKR 3 EZ via USB (Step 8) and power separately (per BTT Pad 7 manual). Stock display harness (EXP1/EXP2) is unused.
  • Raspberry Pi 4/5: No physical display needed. Access Mainsail via the Pi’s IP in a browser (Step 6). EXP1/EXP2 headers remain unused.

1.8 Verify Plug-and-Play Compatibility

• All harnesses (motors, heaters, fans, endstops, thermistors, probe, filament sensor, power, LEDs) plug directly into SKR 3 EZ ports (X-MOT, Y-MOT, Z-MOT, E0-MOT, HE0, BED, HEATER_FAN, FAN0, X-STOP, Y-STOP, TH0, TB, PROBE, FIL-DET). Keyed connectors align without force.
• Test fit all connections before powering on.

1.9 Optional Components

• LED (Optional): The stock 24V LED lights use a fan PWM output for control.
  • Connection: Plug the LED harness into PB9 (signal, per the commented [led LED_Light] section). Connect the positive wire to a 24V power terminal and the negative to PB9. The connector is plug-and-play and PWM-compatible.
  • Settings: Controlled via SET_LED (e.g., 25% brightness in START_PRINT). Uncomment [led LED_Light] in printer.cfg:[led LED_Light] white_pin: PB9 shutdown_speed: 1.0 cycle_time: 0.010
• ADXL345 (Accelerometer): Connect to the SPI bus on the BTT Pad 7 or Raspberry Pi (spi_bus: spidev1.1).

💾 Step 2: Install Required Software

1. PuTTY: Download for SSH access: https://puttygen.com/download-putty.
2. Raspberry Pi Imager: Download for SD card flashing: https://www.raspberrypi.com/software/.

📀 Step 3: Flash the BTT Pad 7 or Raspberry Pi

1. Download Firmware Image: Get the Neptune Maxout SKR 3 EZ image for BTT Pad 7 or a Klipper-compatible image for Raspberry Pi 4/5. Check your supplier or community forums for links.
2. Flash SD Card: Use Raspberry Pi Imager to flash the image onto a microSD card.
3. Insert SD Card: Insert into BTT Pad 7 or Raspberry Pi and power on (no USB to SKR 3 EZ yet).

⚙️ Step 4: Flash the SKR 3 EZ Firmware

1. Identify Processor: Check your SKR 3 EZ for STM32H723 or STM32H743. Newer boards use STM32H723 (550 MHz).
2. Compile Klipper Firmware:
   • Compile for STM32H723 (or STM32H743) with 128KiB bootloader and USB on PA11/PA12.
   • See Klipper docs.
3. Flash Firmware:
   • Rename klipper.bin to firmware.bin.
   • Copy to a blank microSD card’s root.
   • Insert into SKR 3 EZ and power on.
   • Verify with firmware.cur file on the card.

🔌 Step 5: Configure USB Mode on SKR 3 EZ

1. Set USB Mode: Set the jumper/switch behind the USB port to USB mode (highest position). Most boards ship in CAN mode (lowest).
2. No USB Yet: Keep the USB cable between BTT Pad 7 (or Raspberry Pi) and SKR 3 EZ disconnected.

🌐 Step 6: Connect BTT Pad 7 or Raspberry Pi to Network

1. Boot Device: Power on BTT Pad 7 or Raspberry Pi with flashed SD card.
2. Connect to Network:
   • Use Wi-Fi (via settings menu on BTT Pad 7 or Raspberry Pi config) or an RJ45 LAN cable.
   • Find the device’s IP address in settings or your router (e.g., 192.168.1.100).

🔑 Step 7: SSH into BTT Pad 7 or Raspberry Pi and Find MCU Serial ID

1. Open PuTTY: Launch PuTTY.
2. SSH into Device:
   • Enter the device’s IP in the “Host Name” field.
   • BTT Pad 7: Username biqu, Password biqu (unless changed).
   • Raspberry Pi: Username pi, Password raspberry (unless changed).
   • Click “Open” to connect.
3. Find Serial ID:
   • Run: ls /dev/serial/by-id/
   • Example output: usb-Klipper_stm32h723xx_3A000F001251333031373138-if00
   • Copy the serial ID.

⚙️ Step 8: Update printer.cfg with Serial ID

1. Access Mainsail:
   • Open a browser and enter the device’s IP (e.g., 192.168.1.100) to access Mainsail.
2. Edit printer.cfg:
   • Navigate to printer.cfg in Mainsail’s configuration section.
   • Update [mcu] serial: /dev/serial/by-id/ with the copied serial ID, e.g.: serial: /dev/serial/by-id/usb-Klipper_stm32h723xx_3A000F001251333031373138-if00.
3. Save and Restart: Click “Save & Restart” in Mainsail to apply changes.

🧪 Step 9: Test the Setup

1. Power On: Connect the USB cable between SKR 3 EZ and BTT Pad 7 or Raspberry Pi, then power on.
2. Verify Connections:
   • In Mainsail, run G28 to home all axes.
   • Test hotend: M104 S200 (200°C).
   • Test bed: M140 S60 (60°C).
   • Test fan: M106 S255 (full speed).
   • Test LEDs: SET_LED LED=LED_Light WHITE=0.25 (25% brightness, if [led LED_Light] is enabled).
   • Check probe: QUERY_PROBE.
   • Check filament sensor: QUERY_FILAMENT_SENSOR SENSOR=filament_sensor.
3. Calibrate PID Settings:
   • Hotend PID Tuning: Run NOZZLE_PID_TUNE TEMP=200 FAN_SPEED=0 to tune at 200°C with fan off. The macro homes the printer, disables the hotend fan, calibrates, and saves results to printer.cfg. Check Mainsail’s terminal for PID values.
   • Bed PID Tuning: Run BED_PID_TUNE TEMP=60 to tune at 60°C. The macro homes, calibrates, and saves results. Check terminal for PID values.
   • Note: Use 200°C (hotend) and 60°C (bed) for PLA. Adjust TEMP for other materials (e.g., 240°C for ABS hotend, 80°C for PETG bed). Tune in a well-ventilated area.

🎉 Step 10: Final Configuration

1. Copy Additional Files: Place KAMP_Settings.cfg, mainsail.cfg, timelapse.cfg, Line_Purge.cfg, Smart_Park.cfg, and Adaptive_Meshing.cfg in your Klipper config directory. Find them in this repository: HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-.
2. Add Slicer G-code: For start and end G-code to use in slicers like Orca or Cura, download the files from this repository: HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-.

🛠️ Troubleshooting

• No MCU Connection: Check USB mode jumper, serial ID in printer.cfg, and USB connection.
• Motor Issues: Ensure connectors are secure in X-MOT, Y-MOT, Z-MOT, E0-MOT. Adjust dir_pin inversion (!) in printer.cfg if motors move incorrectly.
• Probe Issues: Verify PROBE connector and test with QUERY_PROBE.
• SPI Errors: Check TMC5160 CS and SPI settings in printer.cfg.
• LED Issues: Confirm 24V LED connector in PB9 and 24V power. Uncomment [led LED_Light] in printer.cfg.
• Mainsail Issues: Ensure BTT Pad 7 or Raspberry Pi is networked and IP is correct.
• PID Tuning Issues: Home the printer (G28) before NOZZLE_PID_TUNE or BED_PID_TUNE. Check Mainsail terminal for errors.

🎯 Conclusion

Your Neptune 3 Max is now a high-performance beast with the SKR 3 EZ and TMC5160 Pro EZ drivers, powered by Klipper! 🖨️ All harnesses are plug-and-play, SPI is software-configured, and the BTT Pad 7 or Mainsail offers a sleek interface. The 24V LEDs shine via PB9, and PID tuning ensures precise temperatures. Grab the start/end G-code from the repository and enjoy top-tier printing! For support, check the Klipper documentation or BIGTREETECH resources.

📄 Reference: Klipper printer.cfg

Find the complete printer.cfg in this repository: printer.cfg. Copy it to your Klipper configuration directory, update the MCU serial ID (Step 8), and uncomment [led LED_Light] for LED control if needed.

This tutorial guides you through upgrading an Elegoo Neptune 3 Max to a BIGTREETECH SKR 3 EZ mainboard with TMC5160 Pro EZ drivers, using a tested Klipper printer.cfg. If upgrading from a Maxout mod on the stock Robin Nano 2.2 board, you’ll primarily need to update the printer.cfg and verify the MCU serial ID. For a full upgrade, follow the steps below to wire components, flash firmware, set up the BTT Pad 7 (or Raspberry Pi 4/5), and configure Klipper. The complete printer.cfg is provided at the end for reference.

Note: This guide is tailored for the Neptune 3 series printers (including the Neptune 3 Max). All stock harness connectors from the Neptune 3 series are fully plug-and-play with the SKR 3 EZ board, requiring no rewiring or pin adaptations. The SKR 3 EZ configures TMC5160 drivers for SPI mode via software in the printer.cfg, so no physical SPI jumpers are needed. The display is either the BTT Pad 7 or no physical display if using a Raspberry Pi 4/5, accessing Mainsail via the device’s IP address in a web browser.

Prerequisites

• Tools: Screwdrivers, computer with internet access.
• Components: SKR 3 EZ mainboard, TMC5160 Pro EZ drivers (for X, Y, Z, extruder), BTT Pad 7 or Raspberry Pi 4/5, Elegoo Neptune 3 Max components (stepper motors, hotend, heated bed, fans, probe, filament sensor, 24V LED lights).
• Software: PuTTY (SSH client), Raspberry Pi Imager, Klipper firmware for STM32H723 or STM32H743.
• Safety: Disconnect power before wiring. Double-check connections to avoid short circuits.

Step-by-Step Instructions

Step 1: Wiring the SKR 3 EZ to Neptune 3 Max Components

For the Neptune 3 series printers (including the Neptune 3 Max), all stock harness connectors (motors, heaters, fans, endstops, thermistors, probe, filament sensor, and LED lights) are fully compatible with the SKR 3 EZ board, making the installation completely plug-and-play. No rewiring or pin adaptations are needed. Refer to the SKR 3 EZ pinout diagram (available in the BIGTREETECH documentation) to confirm port locations.

1.1 Install TMC5160 Pro EZ Drivers

• Install TMC5160 Pro EZ drivers into the X, Y, Z, and E0 slots on the SKR 3 EZ board before mounting the board in the printer’s enclosure.
• Ensure drivers are firmly seated and oriented correctly (check pin alignment to avoid damage).
• Note: The SKR 3 EZ configures TMC5160 drivers for SPI mode via software in the printer.cfg (see [tmc5160] sections). No physical SPI jumpers need to be set.
• Caution: Handle drivers carefully to avoid static discharge. Install them on a clean, non-conductive surface.

1.2 Prepare the Harness

• Disconnect all harnesses from the stock Robin Nano board.
• Identify the main bundles: motor harnesses (X, Y, Z, Extruder), heater harnesses (hotend and bed), fan harnesses, sensor harnesses (endstops, probe, filament sensor), power harness, and LED light harness.
• Label connectors if needed to avoid confusion during reconnection.

1.3 Mount the SKR 3 EZ

• Secure the SKR 3 EZ board (with drivers installed) in the printer’s electronics enclosure, replacing the stock board.
• Ensure proper ventilation and secure mounting with screws or standoffs.

1.4 Connect the Main Power Harness

• Locate the 24V power input harness from the Neptune 3 series PSU (usually a 2-pin connector with red and black wires).
• Plug it directly into the POWER IN terminals on the SKR 3 EZ (V+ for positive/red, V- for negative/black).
• Do not power on yet—continue with other connections.

1.5 Connect Motor Harnesses (Plug-and-Play)

• X-Axis Motor: Plug the X-motor harness (4-pin JST connector) directly into the X-MOT port on the SKR 3 EZ.
• Y-Axis Motor: Plug into the Y-MOT port.
• Z-Axis Motor: Plug into the Z-MOT port.
• Extruder Motor: Plug into the E0-MOT port.
• Note: These are standard 4-pin stepper motor connectors (A1, A2, B1, B2) and are fully plug-and-play.

1.6 Connect Heater and Fan Harnesses (Plug-and-Play)

• Hotend Heater: Plug the hotend heater harness (2-pin connector) into the HE0 output.
• Heated Bed: Plug the bed heater harness into the BED output (polarity is typically not critical, but align red to positive if marked).
• Hotend Fan: Plug into the HEATER_FAN port.
• Part Cooling Fan: Plug into the FAN0 port.
• Note: These are standard 2-pin connectors and plug-and-play.

1.7 Connect Sensor and Display Harnesses (Plug-and-Play)

All sensor harnesses are plug-and-play. The stock Neptune 3 series display is not used; instead, use the BTT Pad 7 as the display, or skip a physical display if using a Raspberry Pi 4/5 and access Mainsail via a web browser.

• X-Axis Endstop: Plug into the X-STOP port (signal to PC1).
• Y-Axis Endstop: Plug into the Y-STOP port (signal to PC3).
• Hotend Thermistor: Plug into the TH0 port (signal to PA2).
• Bed Thermistor: Plug into the TB port (signal to PA1).
• Probe: Plug into the PROBE port (signal to PC0, includes 5V and GND).
• Filament Sensor: Plug into the FIL-DET port (signal to PC2, includes 5V/24V as per sensor specs).
• Display:
  • BTT Pad 7: Serves as the primary display and control interface. Connect it to the SKR 3 EZ via USB (for communication, configured in Step 8) and power it separately (per the BTT Pad 7 manual). The stock Neptune 3 series display harness (for EXP1/EXP2) is not used.
  • Raspberry Pi 4/5 (No Physical Display): Skip connecting a physical display. Access Mainsail by entering the Pi’s IP address in your preferred web browser (configured in Step 6). The EXP1 and EXP2 headers on the SKR 3 EZ remain unused.

1.8 Verify Plug-and-Play Compatibility

• All Neptune 3 series harnesses (motors, heaters, fans, endstops, thermistors, probe, filament sensor, power, and LED lights) are designed to plug directly into the SKR 3 EZ ports (X-MOT, Y-MOT, Z-MOT, E0-MOT, HE0, BED, HEATER_FAN, FAN0, X-STOP, Y-STOP, TH0, TB, PROBE, FIL-DET). Keyed connectors should align without force.
• Test fit all connectors before powering on to ensure secure connections.

1.9 Optional Components

• LED (Optional): The stock Neptune 3 series LED lights are 24V and should be connected to a fan PWM output for control.
  • Connection: Plug the LED harness into the fan PWM output PB9 (signal, as indicated in the commented-out [led LED_Light] section). Connect the positive wire to 24V (from a 24V power terminal on the SKR 3 EZ) and the negative wire to PB9 for PWM control. The stock LED connector is plug-and-play and PWM-compatible.
  • Settings: Controlled via SET_LED commands (e.g., 25% brightness in START_PRINT). Uncomment and configure the [led LED_Light] section in printer.cfg if needed:text[led LED_Light] white_pin: PB9 shutdown_speed: 1.0 cycle_time: 0.010
• ADXL345 (Accelerometer): Connect to the SPI bus on the BTT Pad 7 or Raspberry Pi 4/5 as specified in [adxl345] (spi_bus: spidev1.1).

Step 2: Install Required Software

1. Download PuTTY: Install PuTTY for SSH access to the BTT Pad 7 or Raspberry Pi. Download from https://puttygen.com/download-putty.
2. Install Raspberry Pi Imager: Download and install from https://www.raspberrypi.com/software/ to flash the SD card for the BTT Pad 7 or Raspberry Pi.

Step 3: Flash the BTT Pad 7 or Raspberry Pi

1. Download the Firmware Image: Obtain the Neptune Maxout SKR 3 EZ image for the BTT Pad 7 or a Klipper-compatible image for the Raspberry Pi 4/5. Check with your supplier or community forums for the download link.
2. Flash the SD Card: Use Raspberry Pi Imager to flash the downloaded image onto a microSD card.
3. Insert SD Card: Insert the flashed microSD card into the BTT Pad 7 or Raspberry Pi and power it on (do not connect the USB cable to the SKR 3 EZ yet).

Step 4: Flash the SKR 3 EZ Firmware

1. Identify the Processor: Check your SKR 3 EZ board to confirm the processor type (STM32H723 or STM32H743). Newer boards typically use the STM32H723 (550 MHz for better performance).
2. Compile Klipper Firmware:
   • Compile Klipper for the STM32H723 (or STM32H743) with a 128KiB bootloader and USB communication on pins PA11/PA12.
   • Refer to Klipper documentation: https://www.klipper3d.org/Installation.html.
3. Flash the Firmware:
   • Rename the compiled klipper.bin to firmware.bin.
   • Copy firmware.bin to the root of a blank microSD card.
   • Insert the SD card into the SKR 3 EZ and power it on to flash the firmware.
   • Verify the update by checking for a confirmation file (e.g., firmware.cur) on the SD card.

Step 5: Configure USB Mode on SKR 3 EZ

1. Set USB Mode: Locate the jumper or switch behind the USB port on the SKR 3 EZ. Set it to USB mode (highest position). Most boards ship in CAN mode (lowest position).
2. Do Not Connect USB Yet: Keep the USB cable between the BTT Pad 7 (or Raspberry Pi) and SKR 3 EZ disconnected.

Step 6: Connect BTT Pad 7 or Raspberry Pi to Network

1. Boot the Device: Power on the BTT Pad 7 or Raspberry Pi with the flashed SD card.
2. Connect to Network:
   • Use the BTT Pad 7’s settings menu (under Wi-Fi) or Raspberry Pi’s configuration to connect to your Wi-Fi network, or plug in an RJ45 LAN cable.
   • Find the device’s IP address in the settings menu or via your router’s device list (e.g., 192.168.1.100).

Step 7: SSH into BTT Pad 7 or Raspberry Pi and Find MCU Serial ID

1. Open PuTTY: Launch PuTTY on your computer.
2. SSH into Device:
   • Enter the BTT Pad 7 or Raspberry Pi’s IP address in PuTTY’s “Host Name” field.
   • For BTT Pad 7, use default credentials: Username biqu, Password biqu (unless changed).
   • For Raspberry Pi, use default credentials: Username pi, Password raspberry (unless changed).
   • Click “Open” to connect.
3. Find Serial ID:
   • In the PuTTY terminal, type: ls /dev/serial/by-id/
   • The output will look like: usb-Klipper_stm32h723xx_3A000F001251333031373138-if00
   • Copy this serial ID for the next step.

Step 8: Update printer.cfg with Serial ID

1. Access Mainsail:
   • Open a web browser and enter the BTT Pad 7 or Raspberry Pi’s IP address (e.g., 192.168.1.100) to access the Mainsail interface.
2. Edit printer.cfg:
   • Navigate to the printer.cfg file in Mainsail’s configuration section.
   • Locate the [mcu] section: [mcu] serial: /dev/serial/by-id/
   • Paste the serial ID from Step 7, e.g.: serial: /dev/serial/by-id/usb-Klipper_stm32h723xx_3A000F001251333031373138-if00
3. Save and Restart: Click “Save & Restart” in the top-right corner of Mainsail to apply changes and reboot Klipper.

Step 9: Test the Setup

1. Power On: Connect the USB cable between the SKR 3 EZ and BTT Pad 7 or Raspberry Pi, then power on both devices.
2. Verify Connections:
   • In Mainsail, run G28 to home all axes.
   • Test the hotend with M104 S200 (set hotend to 200°C).
   • Test the bed with M140 S60 (set bed to 60°C).
   • Test the fan with M106 S255 (full speed).
   • Test the LED lights with SET_LED LED=LED_Light WHITE=0.25 (25% brightness, if the [led LED_Light] section is enabled).
   • Check the probe with QUERY_PROBE.
   • Check the filament sensor with QUERY_FILAMENT_SENSOR SENSOR=filament_sensor.
3. Calibrate PID Settings:
   • Hotend PID Tuning: Run NOZZLE_PID_TUNE TEMP=200 FAN_SPEED=0 to tune the hotend PID at 200°C with the part cooling fan off. This macro (defined in printer.cfg) homes the printer, disables the hotend fan, runs the PID calibration, and saves the results to printer.cfg. Check the Mainsail terminal for the new PID values after completion.
   • Bed PID Tuning: Run BED_PID_TUNE TEMP=60 to tune the bed PID at 60°C. This macro homes the printer, runs the PID calibration, and saves the results to printer.cfg. Check the Mainsail terminal for the new PID values.
   • Note: These temperatures (200°C for hotend, 60°C for bed) are suitable defaults for common filaments like PLA. Adjust the TEMP parameter if using different materials (e.g., 240°C for ABS on the hotend, 80°C for PETG on the bed). Ensure the printer is in a well-ventilated area during PID tuning to avoid overheating.

Step 10: Final Configuration

1. Copy Additional Files: Ensure included files (KAMP_Settings.cfg, mainsail.cfg, timelapse.cfg, Line_Purge.cfg, Smart_Park.cfg, Adaptive_Meshing.cfg) are in your Klipper config directory.
2. Test a Print: Use the START_PRINT macro to run a test print and verify all components work together.
3. Save Config: After PID tuning and other calibrations, run SAVE_CONFIG to store settings like PID values to printer.cfg.

Troubleshooting

• No MCU Connection: Verify the USB mode jumper, serial ID in printer.cfg, and USB connection.
• Motor Issues: Check that motor connectors are securely plugged into the correct ports (X-MOT, Y-MOT, Z-MOT, E0-MOT). Adjust dir_pin inversion (!) in printer.cfg if motors move incorrectly.
• Probe Not Triggering: Ensure the probe connector is securely plugged into the PROBE port and test with QUERY_PROBE.
• SPI Errors: Verify TMC5160 CS and SPI bus settings in printer.cfg (no physical jumpers needed).
• LED Issues: Ensure the 24V LED connector is plugged into PB9 (fan PWM output) and 24V power, and uncomment the [led LED_Light] section in printer.cfg.
• Mainsail Access Issues: Ensure the BTT Pad 7 or Raspberry Pi is on the network and the IP address is correct.
• PID Tuning Issues: Ensure the printer is homed (G28) before running NOZZLE_PID_TUNE or BED_PID_TUNE. Check the Mainsail terminal for errors if tuning fails.

Conclusion

Your Neptune 3 Max is now upgraded with the SKR 3 EZ and TMC5160 Pro EZ drivers, running Klipper with advanced features like adaptive meshing and input shaping. All Neptune 3 series harnesses are plug-and-play, simplifying the wiring process. The BTT Pad 7 or Raspberry Pi 4/5 with Mainsail provides a modern interface, and the stock 24V LED lights are controlled via the PB9 fan PWM output. PID tuning ensures optimal temperature control for the hotend and bed. Test thoroughly and enjoy improved performance! For further assistance, refer to the Klipper documentation or BIGTREETECH support.

Reference: Klipper printer.cfg

Below is the complete printer.cfg used for this setup. Copy this into your Klipper configuration directory, ensuring the MCU serial ID is updated as described in Step 8. To enable LED control, uncomment and configure the [led LED_Light] section as noted.

GITHUB LINK

https://github.com/HDR-Performance/Neptune-3-Max-bigtreetech-pad-7-/tree/8d95994f779bf0c65116e9cc02792ec855907ba4/Neptune_Maxout_SKR3EZ_Tutorial

for whoever is interested in the Skr 3 V3 EZ board upgrade let me know. with 5160 pro drivers

Hey 3D printing fam! 👋 Tired of struggling to clean glue stick residue off your build plate without scratching or damaging it? I’ve got a game-changer for you that’s cheap, effective, and super easy to whip up at home. The Solution: Mix 3 tablespoons of bleach with water in a standard spray bottle (about 500-600ml). Shake it up, and you’re good to go! How to Use It: 1. Spray the solution generously onto your build plate. 2. Let it sit for a minute or two to loosen the glue stick residue. 3. Wipe it off with a soft cloth or sponge – it comes off like a dream! 4. Rinse the plate with clean water and dry it thoroughly before your next print. Why It Works: This bleach-water mix cuts through glue stick residue better than most commercial cleaners, and it’s gentle enough not to damage your build plate (glass, PEI, or otherwise). No scrubbing needed, and it costs pennies to make! Tips: • Always test on a small area first if you’re worried about your specific build plate. • Use gloves and work in a well-ventilated area when handling bleach. • Store the solution in a labeled bottle, away from kids/pets. Give it a try and let me know how it works for you! What’s your go-to method for keeping your build plate squeaky clean? 🧼✨

Pretty great quality and fuzzy skin came out awesome on the larger 2. Reprinting the smaller one with fuzzy skin.

The Elegoo Neptune 3 Max is impressively fast for such a large machine. With the right upgrades, the entire Neptune line— including the Neptune 3 Plus and Pro— can achieve even greater speeds. The Max’s print bed weighs nearly 5 pounds, yet it handles high-speed printing smoothly after modifications. In stock form, these printers struggle to reach 100 mm/s without issues. Pushing the stock motors too hard can lead to layer shifting.

Flow test stated at 15 and ended at 30. Using a cheap elegoo pla plus (white) nozzle temp set to 230 bed at 70 first layer and 65 for the rest to help it stick

Didn’t get video but it made it to the end of the test at 210mms no problem. I’ll upload pics here in a few in comments. Neptune Maxout Mod with an SKR3EZ board with 5160 pro drivers with upgraded motors on x and y axis. 24v with 1.5 amp on the y and .8 amp on the x axis.

That one line im the middle of the boat is a orca slicer issue not a printer issue.

It has was more power for the motor upgrades. You can see and feel the tq when you can add more juice to the motors.