FireCracker Cannon (4.5mm)
thingiverse
I designed this firecracker cannon using Fusion 360. Unfortunately, my printer is currently out of order, so I won't be able to test it until further notice. Nevertheless, I'm confident that if printed at 100% infill with decent resolution, it should work properly. If you decide to test/print this design, feel free to comment or email me with any questions or suggestions. This Cannon is specifically designed to accommodate a standard 4.5mm BB. The back screws off to expose a slot for inserting a firecracker, fuse end first. After that, simply screw it back on, place a BB down the barrel, and you're ready to fire.
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