New version: https://www.printables.com/de/model/418290-sanding-wedge-v2
I used an M6 screw and nut to clamp the sandpaper down. The screw and nut are glued in place.
I used PLA but ABS would be better.
You need to print 3 parts:
You also need:
The author marked this model as their own original creation. Imported from Thingiverse.