A small sanding block that easy to load (you don't need 3 hands). Uses a paper size 110x90mm.

Print settings:-

0.20mm layer height

3 Walls / perimeters

The base should have an extra layer or 2 depending on how long and hard you plan to use it for.

The handle could be printed stand up without supports and as I did, lying flat with tree supports.

I used ABS for all parts and the fits were perfect, if you have trouble with the nut being too tight you can scale it to 101% in X&Y only and reprint it.

I used a drywall screw in the base to make the threaded part stronger, PETG probably won't need it but ABS does.