About this 3D model

This was inspired by the Prusa i3 base plate. Changes: - Support for both LM8UU bearings with zip ties and pillow blocks (SC8UU) - Mounting holes for both ubiquitous PCB heatbed (MK1/MK2) and Helios heat bed with 3-point mounting. (104.75mm centers) - Added belt holder mounting holes closer to the dual bearing side.