1 minute ago, GregValiant said:I usually open the gcode file and add fan lines manually. You can try the ChangeAtZ post processor. It had a couple of glitches if you were using "By Height" and there were Z-hops in a file, but without Z-hops and using "By Layer" it should be OK. You would need one instance to turn the fan on and another to turn it off again.
Thanks for the ideas, got me thinking! Unfortunately, I do have (and need) Z-hops and it's not a by-layer situation for me. The parts I'm working on are quite large, most of the area of the build plate, and only have overhangs in a few small portions of the perimeter. The fans need to stay off for the rest of the layer, to ensure good layer adhesion, and only come on for the actual overhanging portion. I suppose I could theoretically do it by manually editing the g-code, but that would really be a prohibitive editing process without much chance of automating it.
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GregValiant 1,342
I usually open the gcode file and add fan lines manually. You can try the ChangeAtZ post processor. It had a couple of glitches if you were using "By Height" and there were Z-hops in a file, but without Z-hops and using "By Layer" it should be OK. You would need one instance to turn the fan on and another to turn it off again.
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