This is another version of the adapter to allow you to make use of the makerbot style plastruder tip on a mendel. This fits just below the extruder stepper assembly.place the two m3 nuts in the captive nut sockets. Add or remove m3 washers as needed to adjust seating of the thermal insulator. For mendel extruders which have the slot in place, add a section of insulator to fill the hole for the insulator, or print a new extruder without the insulator hole.