Hey guys, can anyone please recommend how to make a piston for putting inside the pipe to hit the ping pong ball and also please tell me what I can make it out of very detailed-ly?
O-ring around a plastic part, which can be easily designed and 3D printed if you have access to that. If not, try 3 disks: 2 a bit larger and 1 a bit smaller in diameter. Drill a hole down the middle of all disks, sandwich in this order through a threaded rod: large, smaller, large; the o-ring goes around the smaller one. Use nuts/washers to fix the disks in place. I can make a diagram in a day if this isn't clear. And use lubrication. You might need 2 pistons on a rod (kind of like a barbell) so the piston only moves linearly...
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