This is a replacement loop for Loopy brand phone cases. This must be printed in TPU. Preferably the softest TPU you can print with. I printed this as a replacement when I tore my loop.

I printed mine with 85a TPU. The result is not as soft as the original loop my case came with, but it does fit into my case and surprisingly comfortable to use. It is a little tough to get through the hole in the phone case but it should fit. If it does not, you should be able to scale it down a bit in your slicer. Just make sure you scale the correct axis.

I think that a TPU with more elasticity would be closer to the feel of the original loop. You may have to adjust your top and bottom solid layers if you use a softer material.