RS_CNC_update

This update permits to replace the 625zz ball bearings of the RS-CNC or the RS-CNC32 by some GT2 pulley 20T 5x10 without teeth.

The fasteners used for assembly are the same as those used for the assembly of the original printed parts.

If you encounter some difficulties to insert the pulleys into the "Y_belt_tensioner_A_pulley" and "Y_belt_tensioner_ B_pulley" parts, file their bearings' supports very slightly. Perform insertion tests to ensure that you do not file the parts too much, otherwise you may to have some lateral loose.