Anyway, it turns out my PPE printing has now slammed hard into the max throughput of the Atmega. Time to make code faster. I see lots of divides and soft floats in the planner that can go away...
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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Which means a 40 watt heater tops out at maybe 70 mm^3/s. Of course that's absolute maximum speed, ignoring practicalities like heat loss to the outside. And thermal conductivity might be the real limit here, making this calculation irrelevant. But raw wattage isn't a problem.
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