X carriage upgrade for K40 laser engraver FreeCAD

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4928930.

Be careful ! this version does not integrate the K40 original endstops. Edit: I replaced original optical switches with mechanical ones.

This is designed for 2XLM10UU bearing and 2X10mm linear shaft (42 mm length).