Foam Knight Rx - Minimal Hardware

I remixed the wonderful Foam Knight RX https://www.thingiverse.com/thing:4861137 and made it use less hardware so that I could self source. And for fun. I changed all the screws to M3 type, as I have a LOT of them from 3d printer builds. Although I had to keep the 6-32 square nuts, I could not find a metric replacement for those after many tests.

I still recommend that you buy the official hardware kit! I am sure it would shoot much faster.

Changes:

• Added dowel, plunger tube, barrel as 3d printed parts. Hope your printer is tuned really well! Make sure to do flow calibration with your filament.
• The RR Logo from the photos is not in the final model here.
• Added grip scales to make it more comfortable.
• Widened trigger for comfort as well.
• Eliminated required 907 O-Ring
• 8-32 ½" → M3*12mm
• 8-32 7/8" → M3*25mm SOCKET HEAD! (must not be button head)
• 8-32 square nut, 8-32 hex nuts → M3 hex nuts
• 6-32 ¼" → M3*6mm button head (use thread locker on these)
• 8-32 2" → M3*50mm
• 6-32 3/8" → M3*8mm
• 6-32 1" → M3*25mm

So the only hardware beyond the M3 screws is (2x) 123 Buna O-Ring, a larger Main Spring and smaller Utility spring (I got a pack of springs for $5 from home depot). Some grease for the O-Rings.

Works great printed in PLA with no supports. I did print the grip scales in color changing ABS and acetone smoothed them.