OK, wow, doubling the planner depth does a ton to improve command throughput. Around 30% or so. The math is still too slow, but there's also a bunching issue exacerbating it.
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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As for conduction, I guess that's why those "volcano" brand nozzles are unusually long.
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As for the results, I just tore apart one of the test pieces with pliers. Some areas are more brittle than others, but it's not an adhesion problem: when I try to tear it along layers, the tears end up crossing layers a lot.
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Looking into it, it seems like that's a known effect of overheating. Time to throttle back the temperature, it seems (and with it likely the printing speed).
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