Penny Launcher

by Zarquon, published

Penny Launcher by Zarquon Jan 28, 2012


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The rubber band powered penny launcher is a staple of engineering inter office warfare. Although it could just be the graduate student research group setting. In any case I saw a few similar disc launcher things but nothing that really suited my needs. This is just a simple version I quickly tossed together. The range is easily across the lab using standard rubber bands double wrapped on each side.

For those not in the US, the penny is about 19mm across and 1.55mm thick.

Update 3/1/12
I’ve added a version with fixed geometry. It slices without any errors and warnings for me. If you somehow get an error please let me know.


Print all 3 pieces and assemble with #4-40 screws. About .5 inch in length is needed. The front screws need to be tight and the back screws need to be loose so it doesn't jam.

You'll need to make the slider (piece 3) solid so it doesn’t break easily. Even then they will break occasionally in normal operation. It's a quick piece to print and replace anyway.

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Nice thing!
I love you guys in the U.S. :-)
You have a 19mm penny, but 4-40 inch screws with .5inch in length. :-D

penny_gun.stl sliced incorrectly with slic3r.

Yeah I'm aware that there are some minor holes in the mesh. If possible you should consider slicing it with skeinforge or similar slicer. I used SFACT which was capable of fixing the mesh on the fly.

Sorry. I designed this in Google sketchup which isn’t the most robust application for drawing manifold solids for printing. I think the problem here is that the curved surface around the penny slot somehow drew partially inside out and didn't correctly reverse when I tried to fix it.

I upload
ed a slightly modified version which fixes some of the old errors but some of holes still exist.

Very nice; I'll be bringing a few of these to work Monday.