I really jammed my lulzbot extruder hotend badly today, but was able to fix it (thankfully). This is for a custom build (https://github.com/mirage335/TazStiff), so definitely not a standard Taz setup.
The micro blower for the hotend wasn’t running and it was too late before I realized it (PLA melted all the way up the metal feed tube).
The way I fixed it was as follows:
- Remove hotend from all plastics on the extruder assembly
- Heat hotend to ~ 230 C
- Pull out as much PLA as was possible from the top of the hotend
- Remove the bowden tube set screw (Is there a better way to describe this piece?)
- Used hemostats or some other long, skinny plier-like device to massage the PLA until I could get a grip on it and pull it out
- Used the flat end of a 7/64 drill bit to push any remaining PLA down into the nozzle and out. I made sure the tube leading to the nozzle was
- clean before finishing up.
Here is what it looked like as I was taking it apart and the pieces I was able to pull out:
I am very happy that I was able to fix this and remedied my micro blower fan issues (Had a loose connector).