On the X1C, I use 235°C nozzle and 20% fan (both part and aux) for redline PETG. I’m not sure if that translates directly to the A1. And I have completely disabled the increase of fan speed for overhangs and short layer times. It also can easily handle 20 mm³/s.
Honestly I printed only a few samples up to now to dial in settings, but I was very pleased with the results. Only layer adhesion was worse than others. See my comparison.
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