LowRider 3 CNC SKR+Raspberry Pi Control Box

This is a re-remix of Jeffeb3's remix of the LowRider3 CNC's control box. It enables mounting the SKR 1.3/1.4 controller, a Raspberry Pi 2B/3B/3B+, and LM2596 buck converter. Optionally, I also glued in 2 x Wago mounts to distribute power within the case. All screw holes are designed for M3 BHC.

Changes:

- Lengthened case by 20mm to accommodate additional hardware - Shifted SKR board back to make room for cable routing on all sides of the PCB - Added a 30x10mm fan to keep things inside the case cool(er) - Rotated Raspberry Pi to externally expose ports and re-oriented to be parallel with the bottom of the case. - Added mounting points for an LM2596 buck converter to power the Pi. - Relocated V1 logo cutout to the right of the Pi to accommodate power ingress. Note: The taller blue heatsinks that came with my stepper drivers were a little too tall for the lid to close without touching. I opted to use some lower-profile heatsinks to resolve the clearance issue.