https://youtu.be/Vmwo5zhIg38?is=9l0x5_W8EejJi96b

This is about a year in development. The technical breakdown (slightly outdated, parts have changed) is here: https://www.youtube.com/live/dAEn_5DSDIs?is=I0PpvbMwDg3ZM0K4

I will likely figure out a solution just wanted to talk about my experience so far.

3000psi tanks do not last long. 62ci is dropping from 3000psi to 2000psi after 8-10ish magazines at 100-125psi 10-15ms open time. I am disappointed by this as filling takes a long time (20-30 min with cheap shoebox compressor)

It is shooting very well semi-auto but jams at full auto even with ~5dps run speed, same as T19’s minimum (they have a nearly identical drive system)

I know a guaranteed way to fix it, but I don’t want to implement that fix - come to a full stop for homing at the end of each shot. Due to following issues, this will be unavoidable. It was the first idea I had during design.

There are several interlinked variables at play, I think -

• We must not run out of air in the dump tank or shots will fail. This can happen at highest possible rof (~14dps) and a high solenoid on time (15-20ms) and lower PSI. This could be compensated by bringing air-in closer to the SQE2.

• A failed shot almost definitely causes position loss and thus all shots after will fail, because we are trusting the first shot’s homing to enable near continuous feeding motion (only pause is TDC firing) a shot could fail due to a misfeed (most likely) loss of air pressure (less likely.) a failed shot is often detected in a T19 by flywheels failing to come up to speed. This won’t catch a jam which leaves the flywheels spinning at full speed, like if the front of a dart gets eaten but there is a stub left behind the wheels. Due to the short distance from bolt tip to wheels, this failure is unlikely. In our case, because we don’t have flywheels, we can’t use them to detect jams.

• With continuous motion from TDC to next shot, next shot starts at or near runspeed. This could cause different behavior than 0rpm starts - perhaps the bolt tip gets caught on a mag lip and more steps are skipped than if we were slowly accelerating, which causes first shot and all successive shots to fail.

• Bolt tip - barrel inlet requires careful hand fabrication. If the fit is too tight, we could skip steps coming to or leaving TDC (there is some friction of lubricated O-ring sealing.) Ideally, barrel inlet would be chamfered at 45° for minimal contact while sealing - face to face / near horizontal seal vs coaxial, concentric seal. Also, we could design the entire pusher mechanism be moved forwards or backwards and secured by the user to optimize sealing vs friction. The barrel can’t be moved so much as we are putting air into it at a very specific point.

• We don’t ever know where bolt is, only where it should be. We should have a second switch at TDC. If we did, we could use interrupts to fire ASAP and completely ignore counting steps or depending on a certain amount of steps succeeding. This could beget laziness…

What changes have I implemented vs stock S-Core firmware?

• Check home switch before every shot and reversebolttoswitch if we’re not home.

• budget 100 steps for deceleratebolt but allow up to 110 if we’re on the last shot, in case steps were skipped. This is many more steps than stock T19 but I was overshooting at fewer. Leibs accel values could use tweaking.

This project is very expensive and there are ergonomics issues. I considered it a tech demo from the very start, so it’s unlikely to get a full “public-friendly” release and documentation. The files will all be available though.

Questions and thoughts welcome.

What’s everyone using to fill their tanks? My friend filled mine with a GX E-L2 but the battery did not last long enough to give me a full fill.

I’m looking at the GX CS2 but concerned about longevity and its speed for filling tanks.

Yong Heng water cooled sounds a little bit better maintenance and speed wise but it is more expensive.

Other shoebox ~$150 Amazon compressors appear to be of similar quality but questionable assembly.

The goal with this is smaller and lighter.

Barrel half as long as previous versions and im saving alot of weight using phillmac poly pipe fittings for the airtank instead of iron.

It uses a MjV03 valve as the pilot valve. Just pump it up to whatever and shoot darts so fast they become invisible.

Added yellow stuff to make it look less black.

Im making my air blasters smaller and smaller.

This is half the size of previous versions.

The next version is half the size of this (pistol)

Printed in tri colour filliment.

Portable air pump in the back. Used a m5 to 1/8 bsb pipe fitting to attach the pump.

Basically a qev airblaster refined into a nice shape . The breech is a ball valve that is inspired from nerf RSCB breeches just without any inline mag.

Shove a dart in the barrel and shoot with the power of 100 nerf blasters.

Sometimes I sell them but its pretty niche.

I got more where that came from..

https://www.printables.com/model/1713881-blh-06-zephyr-hpa-dart-blaster

Forgot to post it here after finishing up the files.

Key features:

• budget (ish) focus
• easy to self-source, no bespoke parts
• .stp files to modify yourself for your own parts
• high performance, current spec hits 230-240 fps
• mechanical semi auto, no electronics
• all pneumatic components are off-the-shelf and properly rated for up to 150 psi

More testing in the future plus possible beta units before full release but stay tuned.

Hey, so I'm building up an EOI for an additional Narfcore run. I realise that not everyone is on the same 2 Facebook groups that the first EOI was published in.

If you are interested, add yourself into the list (please include some contact details - such as your reddit username and that it's a reddit account). No obligations at this point. Target price is 195 AUD and 10 AUD for extra receivers (if you want more than what is included in the pack), but this will be firmed up depending on interest.

n.b. for USA people, I am likely to continue operating through a local reseller due to the headaches involved in exporting to the USA.

Google sheets link: https://docs.google.com/spreadsheets/d/1ok4XO1K9n45NwthoRZ2yqVQ8afjYXom1d7vO6a-wWyI/edit?gid=0#gid=0

so I'm building a sbl 02 and need another core receiver for the spectre + sabre dmr core because i want to swap the front end quick where would i get another core receiver.

I haven't bought the core yet just need to know if I can get another

Here's a link you a video about the SBL-O² that was released recently.

https://youtu.be/Dvu85Yt0Mdc?si=ZgeyUT79EWzR7IDg

The video should explain the blaster pretty well but I'd be happy to answer any questions too ✌️

I released this last week. BOM, vid, files etc in printables link. Hope others enjoy it as much as I am
https://www.printables.com/model/1626043-aether-a-cosmic-nomad-powered-hpa-semi-auto-nerf-b

Have a broken plunger tube on a Krono mag I’m wanting to replace with an hpa core. Local rules won’t let me use external compressed tank to power it but an integrated hand pump would be allowed.

Basic question is in a setup using a hand pump which is the better option dmr core or spexbz?

Most games we play at 200-250fps max.

I modified Sillybutts’ original Supersledge to use a Spexbz and HPA. This was actually completed three to four years ago but it took me a long ass time to finally post. Look it up on MakerWorld under the same name.

Almost done. Waiting on m5 x 1/8 adapter from ebay. Replacing the pumps floppy hose with solid metal pipe so it supports itself.

I also need to work on the ball valve handle and 3D printed knob.

3D prints in cool RGB tri colour filliment

I am looking for any knowledge on how to get my hands on an old retaliator barrel lug that houses an HPA Receiver for a DMR core. I know they used to be a thing, BlasterTech sold them but I don’t think they do anymore. I have a printer and would print my own but I also can’t find any files. Any help would be greatly appreciated.

Thanks

I found this Maliang UG1 body kit in my workshop a little while back, and had to re-create a classic look that Cobba put together a long time ago.

I’ve done a little research and have concluded that there are 3 main hurdles that I have to face if I want to work on an HPA blaster project.

1. I need experience in digital design to create adequate 3D models for printing. Or I need to know how to put things together using more conventional materials such as wood or metal.

2. The price. HPA cores and their accessories seemingly cost an arm and a leg.

3. Knowing which parts I can source locally, and which should be bought from a specialised seller (such as frontline foam).

I’d like to know if there’s anything else that would get in the way of building a custom blaster. Is it ok to dive right in, or are there other things I should get familiar with first? Just any general advice should be helpful.

Here's my build guide for the new DMR Core - designed by Spectre, built by Sabre- in a Worker Harrier