I’m running into an issue printing… I haven’t seen this type of issue ever reported (anywhere) and I’m stumped as to what the issue is.
I’m printing in PLA on my Taz 4 (I upgraded the bed to the new PEI sheet, but the nozzle is the original (not the all-metal one) and the firmware is still the same (4.1 I think)). Lately when I print, after an hour or so into printing I’ll check on the print… the head will still be moving, the print it still attached to the print bead, and everything will seem normal, except the nozzle isn’t dispensing any filament (event though the filament gears are moving)
Here are some recent prints
You can see that at the top where it fails there are wisps.
From this image you mighty infer that the issue has to do with the z-axis, but I don’t think the z-axis is the case - other failed prints have failed at different heights.
I think the issue might have something to do with the gears chewing up the filament - after a print fails, I’ve removed filament form the hot end, and noticed that its been chewed up.
I thought the issue might have something with retraction, so I created a simple block, printed it w/no infill (this resulted in no retractions), yet the print still failed (and at the same height)
It almost seems that the nozzle gums up and prevent the filament from being extruded, yet, when I remove filament from the hot end, clip the chewed-up end off, and then put the filament back it, it’s able to extrude.
I’ve tried printing w/Cura as well as Simplify 3D but I get the same results. Any suggestions as to what the issue is? Or how to trouble shoot it?