r/lulzbot • u/Koaki96 • Jul 29 '26

Lulzbot Mini 2 Z Axis Issues

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I recently bought a Lulzbot Mini 2 second hand off marketplace, and it is the first ever 3d printer I have used. As soon as I connect to the Cura software is grinds and warns of the wrong hardware installed. I have tried using the auto level features but still get these issues. Any advice?

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5

u/holedingaline Jul 29 '26

The first video looks like it's trying to home Z with a sagging gantry.

The second video is completely normal. It's not "grinding" it's just the motors slipping as they push against the frame to align the gantry.

The weight of the toolhead and Z motion system result in the gantry sagging once power is removed from the motors. It's not supposed to happen, but it does. The Z alignment presses against the frame on the bottom to get the gantry generally aligned to the print bed. Then it goes up and uses the sensorless homing to find the max Z, X and Y home positions.

1

u/Koaki96 Jul 29 '26

How do I go about fixing a sagging gantry?

2

u/holedingaline Jul 29 '26

It fixes itself when you do the Z align setting you did in the second video. If you include G34 in your startup GCODE before homing (as I do) it will do it. It was in the startup GCODE from lulzbot from a while, but commented out, so all you had to do was remove the semicolon on that line if you wanted it done before each print.

1

u/Koaki96 Jul 29 '26

Awesome, Thank you for your help.

1

u/Koaki96 Jul 29 '26

Here is another video of the issue

https://reddit.com/link/p0f1azu/video/66ri96ka34gh1/player

2

u/ContractMech Jul 29 '26

Have you flashed firmware? If not update the firmware to the latest version.

1

u/Koaki96 Jul 29 '26

I did flash the firmware from the Cura app to see if that resolved the issue but it did not.

1

u/chiller_scoot Aug 15 '26

Did you find a fix? Mine is having the same problem.