Summary

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.

Instructions

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.

Robust Simple Catapult