Geeetech / CTC DIY I3 Pro B M6 Z Axis Conversion

Small adapter to use M6 threaded rods in Z axis and replaces M8 lead nut, uses M6 nut and the existing 4x M3 to mount it.

Conversion:
- print 2x M6 Z adapter and put 2x M6 nuts inside (very tight), and mount it to the existing X gantry (white PLA piece in the photo).
- print 2x Z couplers (5mm to 6mm), use 4x M3x10 and 4x M3 nuts per coupler
- optional but recommended: Z Axis Bracket (left & right) with printable bearing, I enclosed the M6 printable bearing, the brackets you find at "**Gee