I’ve been experiencing a mis feed on the TAZ4 every month or so where the filament stops extruding after several layers have been placed. The first few layers always print fine, then it either stops or extrudes intermittently.
I had just gotten done printing with a clear ABS filament then switched to black ABS filament which I use plenty of.
This is the first attempt. You can see that some of the strands are missing:
The hobbed bolt had chewed threw the filament so it was no longer even extruding intermittently. Next, I cleaned the hobbed bolt and attempted again:
The extrusion definitely occurs with fits and starts. I stopped the print before it stopped extruding entirely. I think this last image is the most important, as you can see clearly how it fed the clear filament (left) vs the failed black filament (right):
It seems to get stuck every so often the catch, then get stuck again. We recently built an enclosure but I know the filament travel path is pretty low resistance. The ambient temp at the time of failure is 90F, with a bed plate temp of 95C, a first layer nozzle temperature of 230C which changes to 220C after the second layer begins.