The Brutstruder supplied in the makergear stepper kit was not adequate for my needs, and the mounting system that was supplied wasn't working with my setup. I therefore chose to modify MattewLaBerge's modification of the brutstruder design, and it seems to be holding up. It is no longer "quick change" though (regarding the hot end) because the groovemount is on the back in this version.Print out 2 of the extruder holder pieces. Orient the extruder holder pieces so that they are printed in the orientation as shown in the photograph depicting the assembly. Otherwise, this design is assembled in the same way as http://www.thingiverse.com/thing:5077