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sputnik

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  1. Thanks I had not seen that thread before. I reassembled my damaged hotend and am feeding the filament from the opposite side now; tracks are now on the concave side and that did probably help with friction as my printer is now printing again. the result is not pretty because of underextrusion, but definitely way better than before on the same model. No idea however if it helps with teflon isolator wear.
  2. i have reading the forum a lot recently because on my printer, the original non-glass-filled isolator failed after 230hrs of printing and a new, glass-filled replacement is already worn out after a printing a single roll of filament (colorfabb blueish white, at 210 degrees). i suspect that apart from the isolator unquestionably being too soft, there is maybe another problem that leads to isolator failure, namely the feeder design: the knurled bolt of the feeder is probably running on the wrong side of the filament. when a spool is loaded normally, the knurled bolt is running on the convex o
  3. i stumbled upon this thread while researching my own underextrusion problems; my prints looked pretty much the same as yours, perfect in some places but then random places of underextrusion. larger prints usually failed randomly after 6-10 hours of printing. the extrusion test piece however always printed flawlessly. in my case the problem was the knurled bolt on the feeder. sometimes - depending on where the filament spool sits on the spool holder - the filament was going into the feeder at a slight angle (not exactly vertical but tilted towards the front of the printer); then the fil
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