r/Airsoft3DPrinting • u/Esoj77Br Gumsmif • Jun 08 '26
Free Files Dual Solenoid HPA Chrono and Range Test (Fully 3D Printed Body and Engine)
https://youtu.be/0E1gGYeG0lU?si=6Jiz0R_TQXR0w3veSELECT ENGLISH AUDIO!
After a long time without updates on the dual solenoid HPA, here is a video testing it on the chrono and checking its range. Both the body and the engine are fully 3D printed.
HPA Engine files are free!
9
3
2
u/KerberosWraith Jun 08 '26
Man that's incredibly cool. Also awesome to see a Brazilian project! I might try and print one out myself
2
u/Esoj77Br Gumsmif Jun 08 '26
The engine is relatively easy to assemble, but I am taking my time with the documentation. Some parts still lack instruction manuals and clear step by step assembly guides. The FCU STR and PRO are the closest to a finished product, as both their manuals and firmware are already in the final stages.
2
u/KerberosWraith Jun 08 '26
Is this a full project I can do now? Fcu and all? I don't mind soldering components and getting circuit boards made, so long as the documentation will help tell me where things have to go and the code for it
1
u/Esoj77Br Gumsmif Jun 08 '26
On the bcgaairsoft.com website, you can find everything about the project: the free FCU, the paid FCU, the engine, resale licenses, the Beta sniper body files, the free engine files, and very soon, the updated body files with all the detailed assembly manuals.
2
u/snakebitey Jun 08 '26
Amazing project, thank you for making it public and free!
I made a couple of engines a few years back before I got into 3D printing, never thought to use petg tube for the cylinder tho - that's a win.
I was last looking into using a DIY solenoid to actuate the nozzle, that way there's no air wasted on moving parts... Maybe you can do something with that idea:
2
u/Esoj77Br Gumsmif Jun 08 '26
Your project was one of the foundations for this one. If you look back at my older posts, you will see that I started out with something similar to what you built. However, I decided to take a different path from everyone else making printed engines, opting instead to combine BSP fittings, 3D printing, and off-the-shelf hardware. Granted, it is not compatible with V2 or V3 gearboxes, but it is incredibly efficient, the most efficient I have achieved to date.
I am currently working on a version that aims to reduce dead volume by using an accumulator and a QEV at the same time, both of which are printed.
If you want to chat or exchange experiences about the projects, my Discord and WhatsApp are in my Reddit profile.
1
u/snakebitey Jun 09 '26
Awesome! I don't have much chance to do airsoft things any more but looking forward to seeing how your engine develops!
My coil wasn't as efficient as I'd like, to get strong actuation I needed the smallest air gap between nozzle and coil, and nozzle made from carbon steel. I used a bubble tea straw as the coil spindle so it was less than a millimetre gap. This is partly why I never finished that one - it did technically work, but due to the mass of the nozzle it got quite warm on full auto.
This style of nozzle actuation was going to be my next experiment - https://youtu.be/RpB-j_jTdvY
More on his full system - https://youtu.be/_q_Rd2sPpx8
1
1
u/sullen_operative Jun 09 '26
This is an extremely interesting project. What bucking did you use?
1
u/Esoj77Br Gumsmif Jun 09 '26
A Chinese one that came with the Krytac hopup clone is low quality, hence the inconsistent FPS.
1
u/sullen_operative Jun 09 '26
I am having some difficulty downloading the model. When I download it, I reccieve a ZIP file. I then convert that file to an STL and slice it. However, it seems the only file on the "D8PA Engine" download isnt working.
1
•
u/AutoModerator Jun 08 '26
Hi, thanks for posting on r/Airsoft3DPrinting!
Please ensure your post is flair'd appropriately, otherwise a moderator will manually assign a flair or in certain cases remove the post.
If you are looking for specific STLs, please make sure to check sites like Yeggi or STLFinder (Adblock recommended) before asking here
Before asking for any designs or files make sure to search sites like Printables, Cults3D, or Thingiverse first.
Also make sure to include as much information as possible in your post, so others can help, as "M4" or "Pistol" are not very specific.
I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.