This is part of a set of modular templates which could be used to make a thing. Print them in PETG and use to cut and punch individual pieces.

These aren't meant to assemble anything specific, but should be the interesting parts (like corners or interfaces) to make, like, a bag.

This specific part is an "outside corner". The seam and raw edge is visible in the finished product.

It could be used to make a reinforcing corner, but is really meant to be incorporated into a larger design.