Clip for thick materials

This is a clip to hold things about 20mm or thicker. In the picture 4 clips are helping me make a cyanotype print of some plants.

It comes with a FreeCAD file where you can edit the sketch if you want a different sized clip. Be sure to also get the arch the right thickness -about 3mm. Look towards the last two constraints on the sketch.

I printed mine in PetG with 100% infill. PetG bends a little and is tough. 100% infill makes it almost a solid piece of plastic.