This is a miniature strap wrench that uses a GT2 belt. It is useful for small parts that can't be gripped by a regular strap wrench. It could also be used in the shop or kitchen for small bottle (or tube) caps.

I made this because I needed a tool to rotate a soft plastic part that I couldn't risk marring. The truth is I didn't have time to design and print the wrench so I worked around the problem; but next time I'll be ready!

You'll need a length of GT2 belt to make this. I used about 30 cm.

The source files are available on Onshape: https://cad.onshape.com/documents/3d196b9980f8fb64beeb33e7/w/1d0c79e71ed6389f38a946cb/e/11655dffd2a94d141357192e Onshape is capable of exporting to a number of different CAD formats if you desire.