These are the lower Z motor mount and upper Z mount idler currently being used on the AO-100. The lower Z motor mount includes an adjustable mech stop activator. This activator matches with the current ACME AO X-ends: http://www.thingiverse.com/thing:22760.Note: this Z axis set is for 8mm smooth rods.Source files can be found at download.lulzbot.com/AO-100/hardware/printed_parts/source/Licensing -Parts and files: GPLv3 -Images: CC BY SARequired printed parts: x2 Lower_Z_mount_motor.STL (this file contains two of this part, so only print once) x2 Upper_Z_Mount_Idler.STL x4 Z_clamp.STLHardware: x16 M5 10mm SHCS x8 M5 14mm SHCS x8 M5 Washer x8 M5 Nut x1 M4 60mm SHCS x1 Thumb screw knob for M4 SHCS x8 M3 10mm SHCS x8 M3 Washer