Single Piece Desktop Catapult

Somebody I worked with picked up a little plastic catapult made by Stratasys out of Ultem while at a conference. This is a similar catapult based on the same principles. It prints as a single piece and uses torsional windup of the the throwing arm axle as a spring. The second arm holds the throwing arm in the ready position and acts as the trigger. It can launch a small ball of paper quite a distance.

Intended for PETG and other relatively stiff but yet elastic (not brittle) materials.