Well, that was a fun [but short] run of running stock Prusa firmware. And, FWIW, I like the upcoming changes in 3.9.0. ...tho I think the 'IR sensor is flaky' fixes are a little misguided... ...maybe because I think the problem is something different entirely...
Huh? My E3D v6 clone with a 40W heater and a 1mm nozzle puts down a 1mm wide * 0.7mm high strip of PETG at 30 mm/s just fine. That's 21 mm^3/s.
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How long can it do that, and which PETG? :-) I see cold adhesion failures and texture changes up over 12mm^3/s with PETG that has a high pigment load. I don't exceed that printing masks here. 14mm^3/s produced brittle prints. e3d's official v6 rating for PETG is 8mm^3/s.
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It keeps it up indefinitely, even running prints which involve nearly constant extrusion. This is Overture brand white PETG (my first whack at PETG, bought as a cheap experiment.)
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The only possible downside I've run into is in extrusion control: the nozzle oozes, leading to blobs and gaps after moves. This may be due to heater lag: cold filament heating up in the hot zone and expanding. But I haven't nailed down the cause.
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Well, if you've pushed the meltzone deep into the nozzle while extruding, things get weird when heat flow catches back up. The printers don't model that.
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