Yep printing in ABS. Thanks for the tips. I was hoping to avoid holes in the enclosure. The "theory" of operation with the air scrubber I built is it draws air from inside the cabinet and expels it inside the cabinet, cycling it over and over again, increasing the efficiency of the filters.
But the idea of drawing in cool air (without actually drawing in outside air) did give me the idea to try a peltier cooling module like this one I just ordered https://www.amazon.com/KKmoon-Thermoelectric-Refrigeration-Conduction-TEC1-12706/dp/B074V4RKXM/ref=sr_1_4. I think I can fit that into my air scrubber so the forced air through the scrubber passes over cooled heatsink fins. If that works well I will add some temp control.
You should only use the top cover if you really need it (ABS or similar materials). If you print with PLA your prints will fail, due to too much heat inside.
Putting some ventilator in the case can help, but you should make sure, that also fresh air can get into the printer. There is thread here somewhere, where a user put the printer inside a cabinet and had a lot of problems at the beginning with too much heat. Then he put some ventilators to blow out the heat in the back, but it was still not enough because there was no way for fresh colder air to get in. I think finally he made also some holes in the front of the cabinet to get good airflow to bring the heat out of the cabinet.
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