Lens Cap Rack

It's a rack... for lens caps! I also use it to hold my macro tubes. Tested on my Sony E-mount Lens Caps.

The OpenSCAD file is parametric. The diameter and thickness of each item can be set using an array.

```
// List the thickness and diameter of each item in sequence
THICKNESS = [32, 12, 12];
DIA = [62, 61, 61];

// Set the total y and z-axis depth of the entire thing.
DEPTH = 62;
```