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...
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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I'll do a speed-of-light calculation here. This data sheet: https://devel.lulzbot.com/filament/Rigid_Ink/PETG%20DATA%20SHEET.pdf … seems to have all the relevant numbers, including heat capacities at various temperatures up to and including melting.
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Using an eyeballed rough average of those heat capacity numbers, and plugging it into 'units', I get: You have: 1800 (J/kg/K) * 240 K * (1.27 g/cm^3) You want: watt / (mm^3/s) * 0.54864 So a bit over half a watt per mm^3/s.
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