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The temp in the chamber can usually be regulated by the temp the the heated bed. If you want to have more control it’s very easy to add an exhaust fan but I would hook it up to a temperature controlled switch(the kind used for green houses) for $20-30. You set the temp and it will turn on when above and shut off when below.
-Jesse
Criticalmods.com 26 sells them with or without the fan kit. I would say you would be fine either way.
I wouldn’t use an exhaust with ABS, and for PLA I would print with it off.
Where is your box from and what size is it please? I have been wondering how to create something like this for a nominal cost to hopefully help with ABS warping. I have seen many guides and ideas to cheaply make front doors etc but nothing for the top.
16l litre box from ebay
but you have to cut it
16 days later
ah so you enclose it to keep the heat inside