This is a Linear bearing LM8UU X carriage to allow quick change of Extruders and other tools on your 3D printer.
It has compatible bar spacing for Mendel, Prusa and MendelMax
*Update* 21st - March - Added Greg/Wade extruder adapter plate and all the Sketchup files so you can make whatever adapter plates etc. you may need.
*Added* 31st March - Belt clamp and Low profile catch together - as requested.