Small assortment cabinet

This is my take on a small assortment cabinet. So far, I use it for resistors, see provided photos.

**Cabinet**
The cabinet has 12 x 12 units that can be used for differently wide drawers. It is provided in those two variants:
* One where each row is divided into four sets of three units, That is the file `cabinet - 12x12 - grouping3.stl`.
* One where each row is divided into three sets of four units. That is the file `cabinet - 12x12 - grouping4.stl`.

The dimensions of a cabinet are the following:
* Width: 200 mm
* Height: 150 mm
* Depth: 80 mm (the handles of drawers add another 8 mm to that)

The size of a unit is
* Width: (200-1.2)/12 = 16.57 mm
* Height (150-1.2)/12 = 12.40 mm

**Drawers**
The drawers are provided in widths from one unit to four units. They are provided in five variants:
* With deep side groves intended to make it easy to pick a component from a drawer. Those drawers have the drawback that smaller resistors with shorter connectors tend to fall out of those dr