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

Button Options

• Default: round on top flat on bottom
• Round (print on side)
• Flat

Optional Clasp Add a clasp to connect/disconnect your chain into a loop.

• Print the bottom half of the clasp in rigid filament (PLA/PETG/ABS)
• Print the top half of the clasp in flexible TPU.
• Attach the bottom half of the clasp to your chain using the thinner clasp pin.

Printing

• Print the link cases in TPU - 92A is recommended, but 95A also works.
• 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.

Can I sell copies of this?

Yes! This project was shared under the Creative Commons - Attribution license.

This license allows selling copies, but you must provide proper attribution, as detailed in the license itself.

Please note that any other projects linked here (remixes or related projects) may have a different license. Please respect those licenses.

This license applies only to the model files (STL, 3MF, STEP, F3D) included in this project. It does not apply to photos, videos, my logo, or other supplemental graphics attached to or displayed with this project.