I am planning to vent my P1S with a 4" duct and inline fan outside my house. Question for those that have done this, how did you balance the exhaust fan and the chamber temps? The main reason for the ventilation is for printing CF and GF nylons, which perform better with a heated chamber from what I have read.
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For myself, I got a 3d printer zip up enclosure that the entire p1s sits in. Then I ran a fan from it out of my house. The fan on the enclosure has a variable speed. I tune the fan so that when the zipped up door is closed, it ever so slightly gets pulled inward (i.e minimum negative pressure) and then I print. Works fine