Pretty straightforward - I had a few rolls of sand paper that absolutely needed a 3d printed wall-mount.
Four parts all together:
1) the wall mount base - I added reinforcement (after the V1 design broke while removing it from the build plate). It has four counter sunk holes on the corners that should accommodate most screws/bolts. I added holes everywhere to reduce the amount of filament needed (without sacrificing the structural integrity, I hope). The holes on the vertical sides could also accommodate various sizes of wood/metal dowels (instead of the 3d printed dowels) in case you want to mount tapes of various sizes etc...
2) female dowel
3) male dowel
4) spacer ring
30% for the base, 50% for the dowels