Battery Dispenser - Customizable

A customizable FIFO battery dispenser.

I needed a few dispensers:
* a AA dispenser for 20 batteries
* a AAA dispenser for 15 batteries
* another AA dispenser for 40 batteries.

So to solve all of these simultaneously, I made it customizable.

The STLs are 5 levels, 5 batteries per level AA dispensers, with a 5 degree angle

Edit: So the previous version, with an angle of 2 degrees, is too shallow.
Fixed:
* Batteries might catch in the corners - (use drop ratio to adjust roundness)
* The tray at the front didn't match the incline, which meant if you had one battery left, it might just roll back.
* The overlap jutted out too much, so that the parts didn't fit together properly
* A bunch of other niggling things that was annoying me
* The curve around each wasn't being calculated correctly (drop ratio of 2 would work, anything else would have weirdness)
* Added options for screw wall mounts

Let me know if you find any bugs when customizing.