FireCracker Cannon (4.5mm)
thingiverse
This is a firecracker cannon I designed in Fusion 360. NOTE: My printer is currently not working, so I will not be able to test it until further notice. However, I am confident that as long as it it printed at 100% infill at a decent resolution, it should work fine. If you do decide to test/print this, feel free to comment/email me with questions or suggestions. This Cannon is Designed to Fit a regular 4.5mm BB. The back screws off to reveal a place to slide a firecracker in, fuse first. Then you screw it back on, put a BB down the barrel, and fire it.
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