I wrote Bambu support and they say it’s unavoidable… I think it could be greatly optimized. First the nozzle heats to about 230C and flushes out some filament. Then it waits to cool down to about 140 and does vibration tests and some bed leveling. Then it heats up again to 220 for PLA, wipes a few times, dumps some more filament and THEN it starts printing. For at least a minute it appears to be just setting still doing nothing i.e. no change in temperature.
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