Freewheel Ratchet Fidget - Fully 3D Printed

Totally inspired by the freewheel ratchet fidget (by Need It Make It), this fidget toy has a pleasing clicking sound as you turn it. It demonstrates the engineering concepts of a ratchet and compliant mechanisms.

Features of this model:

• only three parts
• no need for extra materials - all 3D printed with no screws or springs
• no small parts, no overhangs - easy to print
• demonstration of engineering concepts -  compliant mechanisms and ratchet.

The three parts go together in the obvious way. The cap is a press fit, sealing the mechanism. Add a small dollop of CA glue if you don't want it to come apart.

You may also be interested in my updated redesign of this idea. It has better internals and is smoother.