Too bad I'm also hard out of SRAM and flash space.
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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Hm, well, my 30W heater can't even hold 265C at idle if the cooling fan is over 35%. No sock, I keep shredding them. But I think the real limit is the surface area (interface cross section) between nozzle inner bore and plastic, then heat conduction through the plastic itself.
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