uATX computer case

This is a complete case setup for uATX (micro-ATX) size motherboards. I wanted a completely 3D printable, enclosed case that would fit my Prusa i3 MK3S+ but couldn't find any so I came up with this.

** Key features **
* Compatible with uATX motherboards
* Holds full size ATX power supply
* 2 side-exhaust fan mounts
* Slots for up to 4 expansion cards
* Quick-access bay for up to 3 HDDs or SSDs, mounted on tool-free trays (models for both drive types included)
* Internal cable management loops

### Printing

The challenge with a uATX case is many of the dimensions go well beyond the max footprint of the Prusa and similar models. That's why several pieces are split into halves that will be assembled with threaded inserts and screws. Some pieces are still pushed to the edge of the printable area. You will need to print without a brim or skirt and carefully align on the print bed several of the pieces.

The back panel (where the motherboard connectors and cards go) is the la