Though the MendelMax 2 is wonderful - I felt it was missing something, Then i realised what it was; RichRaps wonderful Quick-Fit X-Carriage! I used mine quite a bit with different nozzles for different polymers, So I mashed this up in an evening and voila! One Quick-Fit Extruder mount on the MM2.0 X-carriage plate... I've thickened this up to 6mm for the needed rigidity from a printed carriage so adjust your screw usage accordingly... New to V2.0: Left and Right handed versions available depending on your preference and extruder orientation. 2x 40mm fan mounts (screw holes) added to the opposite ends, PLUS several zip-tie mounting points along the body for 20 or 30mm fans. OSHW / Reprap logo added to the body for both style and strength. I've resized the internal geometry and cutout to make space for the new generation of all-metal hotends, the E3D and Prusa V2 should now fit nicely without needing to customise the extruder block or print spacer platesYou need: Two x M4 (13mm) 624 bearings One 30 to 40mm M4 bolt (Depending on the thickness of your plate) One M4 nut (Nyloc recommended) and a couple of M4 washers for the Quick-Fit Lever. As with all structural parts: print with at least 40% infill / solidity Use at least 2 shells / perimeters Print: 1 Latch, 1 X-Carriage place Bolt and washer through the latch, seat one bearing in the latch and add another washer. place bearing into X-carriage and nut into nut trap, Thread latch through the X-carriage bearing and tighten into the captive nut. And let me know if you try this with Nylon or PC... :)