Ultimate Top Plate for Bondtech Prusa MMU2S MK3S Adaptation

thingiverse

This is a remix of the Top Plate for the Bondtech Prusa MMU2S MK3S Adaptation design. Now you no longer need a Bowden coupler, you can just place the PTFE tube directly in and lock it down with a printable nut. Also includes some other changes: - Printable locking nut to hold PTFE tube in, does not need a metal coupler. This reduces weight on the extruder a bit, which is better for printing. - Brings the PTFE tube directly through the top plate and rests onto the top of the actual extruder hole, so you may have a shorter filament path with less change of MMU error and better printing with flex materials. - Removes the unnecessary open area on the bottom of the original design, so you do not have to use supports there or bridging. - Recessed area for the nylock nut and the M3 screw head, so the overall appearance is more clean. - Slightly lighter design with less plastic used. - Modified design, so you can now use a 20 mm M3 screw for the adjustment screw which will fit perfectly here, and not have screw sticking out to the left above the top plate. Because of this, you can access the bottom screw that holds the top plate onto the extruder at any time without having to remove the adjustment screw and messing up your adjustment. This is designed to print a little tight for the PTFE tube because I am personally using PTFE tubing that has a slightly smaller outer diameter than 2 mm: - If you are having trouble screwing the nut on, just re-print the nut after increasing the X and Y scale in your slicing program by about 2-3%. This is only a 7-minute print. - If you are having trouble getting the PTFE tube into the hole on the top plate, either slightly widen the hole in the top plate with a small drill bit, or enable XY hole compensation in your slicer program and reprint with the hole about 2% wider. - I highly recommend printing the locking nut in PLA if you are printing the top plate in PETG. If you are printing both in PLA, there is no problem. - You DO NOT have to screw the locking nut down all the way to make sure the PTFE tube is locked into place, if you are annoyed that it takes longer to unscrew it than pushing a button on a metal coupler. You may screw it down for aesthetics only. I had to make the nut bigger than necessary because it's a small nut and you need a bigger area to grab on with your fingers. You want the PTFE tube to fit in very snugly (but don't force it in too hard), and then use the locking nut to only tighten it down a bit more and lock it in place. You will get a good feel for it after printing. If you can't pull the PTFE tube out of the extruder by hand, it is in there tight enough. Print @ 0.15mm layer height to make sure the screw threads print nicely, and do not use a nozzle bigger than 0.40mm. For the overhand part, I recommend using paint-on supports in Prusa Slicer.