Wall mounted cup holder

A cup holder meant to be screwed to a wall, I plan to mount it beside my bed since I tend to spill my glass of water often. This would work great for a bunk bed or a loft bed since, you cannot have a nightstand for the top bunk of either. It should fit the 75mm cup I have, and that's about all I need it for.

Note: this is still a WIP, so it might not work at all.