Carriage Module for FLSUN Cube

This is to be a set of carriages for the FLSUN Cube, suitable for the three different extruders supplied in the kit. Each carriage can be swapped in and out with minimal effort by clipping Iand optional bolt) on to the universal belt bracket.
Two problems with the standard carriage are:
1. wrong height for the carriage limit switch - lowered by 2mm
2. Hot end crash into the bed - the new carriage can lift off the front bearings on crash

The universal belt bracket (or bridge) would be perm