RE: unable to resolve underextrusion
Out of ideas. Only thing I can think of is the heat break temperature is under-reporting due to a faulty thermistor. Example, it's says it's 35 but it's really 50.
RE: unable to resolve underextrusion
Out of ideas. Only thing I can think of is the heat break temperature is under-reporting due to a faulty thermistor. Example, it's says it's 35 but it's really 50.
So 35 to 40°C would be okay for the heatbreak temp, but 50° would be too much? Unfortunately I have no clue what values would be considered normal...
RE: unable to resolve underextrusion
So 35 to 40°C would be okay for the heatbreak temp, but 50° would be too much? Unfortunately I have no clue what values would be considered normal...
Above 50° PLA will start to soften. What I'm suggesting is maybe the heat break temperature is higher than what is being reported. Just a guess really.
@conrad-2 suggested you test the effort required to *pull* filament through the ptfe tube but you only reported pushing ... this is a test for internal damage/wear of the tube (usually due to extended use of abrasive filament but there can be other causes) - please complete this test.
You definitely have a cooling air flow problem - this *might* have permitted heat creep or perhaps it is a consequence of multiple repair attempts and not the original issue - if the fans are OK then check the shroud and the air flow path.
Cheerio,
RE: unable to resolve underextrusion
This is starting to sound like an intermittent somewhere in the extruder wiring. The fact that under-extrusion started, then stopped, is odd. You've got a new motor, so it's not the motor. The temperatures don't seem off, though I don't know exactly what the heatbreak temperature should be. 38 doesn't seem that high, since people run the whole unit that high. It's a pita, but you've had so much apart already, I'd inspect all the wiring from the extruder motor on back. Look for cracked circuit board traces and bad solder joints. Magnifier and bright light! You won't be able to tell if there's an actual circuit problem, as opposed to a connection problem, but that's all I can think of right now.