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Robust Simple Catapult

by mattjoyce, published

Robust Simple Catapult by mattjoyce Jan 28, 2013
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I wanted to show my son the process of designing, printing and assembling so I chose to make a catapult. This is a very simple design, and quite robust.

Good use of a rainy afternoon.


Print the following:
1 x Arm
2 x Side
3 X Crossbeam

You may have to whittle the crossbeam end to make them fit, but that's fine, you want a really snug fit.

Fit the crossbeams to one side and then add the second side, use a hammer to persuade them to fit.

Use a length of filament to thread through one side, the arm and the other side.
Use a rubber band to power it.

I will probably update this soon, the axle and fixing points need to be better.

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Oh, not as robust as I thought, my boy broke the bucket off in two days.

Oh, the picture is of an early prototype, the STL files describe narrower sides. (10mm in image, 5mm in stl)