Anycubic i3 Mega extruder for flex or TPU filament

thingiverse

Another extruder designed for printing flexible filament on the Anycubic i3 Mega comes equipped with 4mm PTFE tube requirements. Only about 20-25mm is needed to get started. The original silver collet is reused, allowing users to install it with an M6 nut or my replacement printable insert nut. Next, insert the PTFE until it stops and then trim it to fit using a sharp razor. A tapered diamond file was also used to open up the end of the PTFE tube to a cone shape, helping guide the filament during loading. Although this step isn't strictly necessary, it proves to be very helpful in achieving smooth operation. Below the feed gear lies some extra PTFE tubing for added convenience during filament loading. There's also a nut that screws into the lower portion of the extruder - both features are designed to make things easier. The nut has a funnel shape which guides the filament into the proper location for loading. Historically, users have had trouble finding the lower hole and then getting the filament loaded in the right spot. However, with this setup, users can simply push in the filament until it stops and turn the extruder with their [extruder knob](https://www.thingiverse.com/thing:3777870) to load it the rest of the way. If you don't feel like using the PTFE tubing in the bottom, I've got a variant lower plug available which has a guide tube that replaces the PTFE entirely.