My wife quilts and embroiders. This clip is to insert through her bobbin and into the matching thread spools to keep them together and make for easier sorting and storage. The top allows for a tag or can even be written on with wet-erase markers if you print in ABS.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/chFtGIkhKcv

Printed in ABS because of the material's flex. I did not test in PLA.

Printed with 35% infill, .2mm layer height.

Simply print, remove from the bed, and secure the wishbone in the provided slot in the disk with some superglue or, if using ABS, even a smear of acetone to fuse the pieces.

Result flexes properly while not cracking from stress.