MMU2S PTFE Tube Stabilizer/Tensioner

prusaprinters

I did not create this; I've posted it here in the hopes that it can be helpful to a wider audience. It is currently found on a company website reachable only by direct URL.  Below are the author's notes from that page.  Notes:o   Stabilizes the tubes by keeping them evenly separated and snug.o   Because the tubes in the pathway are now all wider the filament sits “looser” (is that a word??) in the tubes and the filament sometimes had a tendency to fall out of the tubes when it was retracted (and especially if using an auto-rewind spooler since that yanks a little), so I designed this piece with a radius that allows just enough tension to prevent the filament from falling out, yet still does not impede smooth movement.o   The “pigtails” slide all the way into this stabilizer/tensioner.  I orient this so the holes you put the filament in are pointing up – in other words, the side that has “MMU2S” printed on it should be on the left side of the printer (left if you are facing the printer).  o   I did not measure the tube lengths, but I made them long enough to slide all the way into the stabilizer/tensioner and then about 20mm of extra for a gap between it and the compression connectors.o   The STL is not oriented right for printing – print on its side with the part that says “MMU2S” up (no supports should be needed).  I used 0.2mm layers.o   The tubes slip in the end that says “MMU2S” (the other end has a lip to keep them from coming out so don’t try to insert from that end).o   When inserting the tubes be gentle so as to not crinkle them, especially since the sidewalls of the 3mm ID tubing are thin/weak.o   I created this in Fusion 360.