Universal Magnetic Roller Carriage

Re-made the mounting system from scratch to be able to work vertically for the z-axis as well.

It uses 5mm cube magnets, but can fit a 5mm cylindrical magnets too.

Variants included for regular full sized roller wheels, and as mini-roller wheels, as well as variants for 2020 and 2040 spacing, and vertical and horizontal mounting directions.

I'll add more variants when i get to them.