Adapter for flexible Filament Prusa MK3

thingiverse

I've had some issues printing flexible filaments on my Prusa MK3. The filament started to curl around the bondtech or it came out the side hole. The reason for that is that the pathway which the filament travels through into the melt zone leaves too much room for the flexible filament and doesn't prevent it from kinking or coiling inside. Therefore I designed an adapter which reduces the unnecessary space between the bondtech and the hole to the hotend. I've printed it with normal PLA which comes with your Prusa Printer. I recommend printing it with 0.15 mm layer height. It is designed to be inserted without disassembling your extruder. Just open the side of your extruder (see the picture) and push the adapter into the correct position. Tightening the extruder screws should place the adapter in the correct position. One more thing: I had to cut a little bit of the PTFE tube to fit the adapter well. You can use a cutter to remove the PTFE that sticks out of the hole to the hotend, but be careful that the PTFE doesn't fall into the hotend. The adapter is designed to be permanently in the extruder. Once inserted you don't have to remove it for other materials. It just works fine for all materials. Please be aware that printing flexible filaments still needs proper adjustments of your print settings.