Summary

https://youtu.be/DrrydzaBCWM?si=jvyed38CjxWBtsDB

Mechanism 224, from the book 507 Mechanical Movements, is an expanding pulley system where a small gear rotates a larger slotted gear that moves six arms, allowing the pulley to expand or retract its size.

Print the parts as shown in the picture, with each part printed once and the small C-clips printed twice. Watch the video for detailed assembly instructions.

If the assembly isn’t clear enough, please write in the comments, and I'll try to provide further guidance.