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 @20ffb98d @5756e48c In that case you probably just need more cooling. Lowering min speed has diminishing returns IME because keeping the hot nozzle nearly in place for that long dumps as much heat into it as the fans are taking out. 
 @2b562a3e @5756e48c I'm already running full force on a Gdstime 5015 with custom ducts. The ducts may be suboptimal in airflow or direction somewhat, but beyond that, my system's got nothing more to give. 
 @20ffb98d @5756e48c Another option would be printing 2+ at a time or a sacrificial tower just to get some time with nozzle away. Cura has a "lift head" alternative to this too but I find it oozes horribly. 
 @2b562a3e @5756e48c Sacrificial tower might work. I might also look into whether my fan ducting is suboptimal - I suspect it is, but CFD modelling isn't something I know how to do yet. 
 @20ffb98d @5756e48c My rule of thumb is that if there's a real duct (vs mounting the 5015s so the exit basically points the right way, possibly with the need for a single easy curve that doesn't reduce cross section significantly), it's very suboptimal. 
 @2b562a3e @5756e48c Then I'm most likely in that boat.