Summary UP Mini parts for entire extruder replacement with an extruder from China (MK8). All wiring colors match. New mag base is required to position the longer stepper motor and get the nozzle back to center of the build platform. Use all the old electrical plugs from the UP Mini hot end, stepper motor, and fan. You have to use the hot end thermocouple from the Mini since the one supplied will not work with the Mini software. The UP Mini thermocouple fits perfectly and works even though it sticks out a bit. There is a set screw under the insulation surrounding the hot end just for the UP Mini thermocouple. Do not over tighten. Instructions The new extruder assembly is from eBay. http://www.ebay.com/itm/121281423242 Two holes are carefully drilled into the aluminum heat sink on the new extruder to mount the UP Mini printed circuit board holder. I used two #2 x 5/8" sheet metal screw.