An expandable and perpetually poppable fidget toy with a simple TPU mechanism.

Print profile will have two plates to save material and improve print quality.

1st plate - Setup for TPU, printed by object to reduce stringing. Engineering Plate.

2nd plate - Setup for PLA, higher quality, print by layer. Cool Plate.

The design comes from 3DPrinty, I really enjoy his stuff, he has great prints, and great videos talking about assembly or solving his puzzles. I highly recommend you watch! Noticed this Pop Chain wasn't on Maker world so I wanted to share. 

There are additional buttons/links on the original from 3DPrinty if you want additional options. 

Pictures show a chain about 18 links long, about 2 of each plate! But you can make a small one with 9 links.

Printing

• Print the link cases in TPU - 92A or softer is recommended.
• Increase perimeter count in the cases to 4-5 perimeters to provide a solid click
• Print remaining parts in a rigid filament (PLA/PETG/ABS)
• Add brims if bed adhesion is an issue - especially on the small pins

Assembly

• Press-fit buttons into the link case
• Connect link cases together with a pin - pins are intentionally larger than the TPU holes they go into. It's expected that the TPU links will need to stretch a bit.

Attribution Text

"Pop Fidget Chain" (https://3dprinty.xyz/project/105) is designed by 3D Printy (https://3dprinty.xyz) and shared under a Creative Commons Attribution (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/)