I got my TAZ 4 in today and have been running into a snag. I can’t seem to get reliable extrusion without the filament backing up and getting chunks out of it as seen here:
I don’t even have it trying to print but instead have the extruder moved up several inches from the bed and am just pressing the extrude button in pronterface. The first 5-10 presses go great and it extrudes very quickly. But then it slowly starts to extrude less and less until it extrudes nothing at all. Then I open the idler, pull the filament out and clip it back past the messed up part and try again and get the exact same thing.
I already tried using the pick/brush to clean out the hobbed bolt. Same result afterwards.
One thing to note is the quick start instructions seem weird when it says to start with the idler bolts at 10mm and tighten down to ~5mm +/- 2mm. I find it hard to even get them to 10mm (measuring from the outside left of the thumbscrew top to the left outer edge of the plastic clip). I don’t think I could get them anywhere near 8mm, much less smaller. I’ve tried as tight as I can get and I’ve tried it much, much looser and the results seem to be the same.
Any advice as to what’s going wrong? This is using the 1 meter lulzbot green PLA sample included with the printer (more lulzbot filament arrives tomorrow).