About this 3D model

This is a 8mm spacer for Nema 17 to be able to mount this coupler to the Geeetech I3: http://www.thingiverse.com/thing:225753 In combination with this thing: http://www.thingiverse.com/thing:1904968 you get rid of the last tiny bit of z-wobble and the prints are absolute smooth. The aluminium spring coupler still cause a tiny bit of z-wobble that´s why I went with the oldham couplers and they are really worth to try! What you need is: 8 pcs M3x20mm screws to mount the Nema17 with spacer 8 pcs M3 nuts (oldham coupler) 8 pcs M3x6mm headless pin screws (oldham coupler) The shaft of the Nema17 was cut to a length of 10mm.