Parametric tray for small paint pots

## What is this?
Like the name describes, a customizable tray for small paint pots (i.e. miniature gaming paints).

## Why does this exist?
I needed something to support the pots when painting the tiles of my freshly printed [3D Catan set](http://www.thingiverse.com/thing:26979).

The included default tray is for eight standard Vallejo paint pots.