This screws (or adhesive) onto the side of a desk and is the perfect size for an Ifixit Tool Case. There is holes for 2mm x 4 or 5 mm magnets in the right positions.

I printed this in PLA, it shouldn't really matter which filament you use, just pick something that looks good.

Printed on the Ender 3 V3 Se.

Would recommend printing with flat surface on bed, SUPPORT NEEDED for area with screw holes.