Running an exhaust fan after a print
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I'd like to run one of my auxiliary fans (an exhaust fan) at full speed for a few minutes to remove as much of the VOC as possible when a print is complete.
I currently turn it on just a little bit at slow speed to create an ever-so-slightly negative environment. This helps to keep any of the smelly garbage out of my office and it dumps a couple cfm (or maybe cfh) outside through a window adapter.
When a part is finished. I'd like to run the fan full blast for a few minutes to further remove anything still in the chamber.
Side note: I've ordered a chamber scrubber from Alvero3D. I like this option because I can recirculate the air inside the chamber without dumping all the heat. It also uses and H13 HEPA filter and a good size amount of activated carbon and the replacement filters don't cost too much at €19. I am also trying to buy a unit from SYNE, but they are in Poland and I cannot find a reseller.
I'd like to know if anyone has had good luck with scrubbers/filters for their printer.
-Doug
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Are you asking how to trigger the fan?
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I know M106 will trigger the fan. But I want to tell the fan to just run for a period of, say, 300 seconds after the print finishes.
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M106 P2 S1 ; turn on fan
G4 S300 ; dwell for 300 seconds
M106 P2 S0 ; turn off fan -
Cool. Thanks.
That's just what I was looking for. I knew I was overlooking something basic.
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Out of curiosity, can this work with a thermostatically-controlled fan? I.e., keep fan off, then after the print turn on until a temperature sensor falls below a specified value?
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@whopping-pochard said in Running an exhaust fan after a print:
Out of curiosity, can this work with a thermostatically-controlled fan? I.e., keep fan off, then after the print turn on until a temperature sensor falls below a specified value?
Probably yes. Something like M106 Pn Hn S255 T500 in the slicer start gcode will ensure that the fan (Pn) is off (unless the monitored temperature (Hn) is over 500 deg C). Then in the slicer end gcode something like M106 Pn Hn S255 T30 would turn on the fan if the monitored temperature was above 30 deg C.
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Fantastic! Thank you!
