Prusa MK2.5/MK3 X-carriage Split-Back Mod

This is the Prusa MK2.5/MK3 x-carriage back with the following modifications:
- back is split into two pieces
- removing the top piece allows easy access to the x-axis belt
- the bottom piece has a slit in the cable hole, allowing easy cable assembly/disassembly

For MK2.5S/MK3S, see here: https://www.thingiverse.com/thing:3519294

I made the alterations on the original openscad designs from the prusa3d github https://github.com/prusa3d/Original-Prusa-i3/tree/MK3/Printed-Parts/scad .

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