Anycubic i3 Mega extruder for flex or TPU filament

cults3d

Yet another extruder for printing flexible filament on the Anycubic i3 Mega is designed specifically to be used with 4mm PTFE tube, requiring only about 20-25mm. The original silver collet can be reused after installing it with an M6 nut or my replacement printable insert nut. Insert the PTFE until it stops and then trim it to fit using a sharp razor. I also used a tapered diamond file to open up the end of the PTFE tube to a cone shape, which helps guide the filament during loading. Although this step isn't strictly necessary, it's definitely worth doing. You'll notice that there is also PTFE tubing below the feed gear for convenience during filament loading. The same goes for the nut that screws into the lower portion of the extruder - both are designed to help guide the filament into place. I was constantly having trouble finding the lower hole and getting the filament loaded to the right spot, but this setup eliminates those problems entirely. With this in mind, simply push the filament until it stops and then turn the extruder with your extruder knob (as shown in the last photo) to load it the rest of the way. If you don't want to bother with the PTFE tubing in the bottom, I've got a variant of the lower plug that has a guide tube that replaces the PTFE.