Printer: Prusa i3 MK8
Been using this printer with 0.4 nozzle for 2 years and dialed in the process for excellent prints. Always get excellent prints. Always!
I just changed the nozzle to 0.3, and made appropriate changes in s3d.
Problem: First layer can be a mixture of: good, uneven, blobly and infill is light and mostly missing filament. Then, barely nothing comes from nozzle during print. But, I can Pause printing and manually move plastic via extruder axis move (or feeding by hand). A nice stream comes from the nozzle.
I checked and re-calibrated the bed height.
During the print, if I manually (lightly) force the filament, it prints evenly.
I can touch a piece of filament to the nozzle and it melts so, Temp seems good and constant.
Logic would suggest something to do with the filament gear feed but, since it feeds nicely via move axis, and I don’t see any damage or chips of plastic, I think the problem is elsewhere.
I did take it apart and verified the gear is fully engaged into the filament, no damaged parts or damaged/rough filament.
With machine off, I can manually move the filament in and out and it drives the gear/motor without slipping (filament is firmly held). So, hardware seems ok.
I pumped up the Temp to 235C (from usual 230 I print PLA).
Flow Multiplier to 1.09 (also tried 0.90)
Nothing seems to help… I even increased the nozzle/bed gap to much higher than needed... (photo of perimeter taken with larger gap).