Smartcore remix using QU-BD two-up parts

Still working on it.

Edited a few parts to hopefully work better using 8mm rods.
Most of the parts are stock except for a few changes.

The parts will use 8mm bushings instead of bearings. You can get 8mm bushings that will fit into 6mm bearing holes. Hopefully this will reduce to noise of the printer when running.

For my version I will also be printing a Z mod that exists. It uses one motor but braces the print bed at both sides.