STC-1000 is a nice little temperature controller that can be used to control both a heater and a ventilation in an enclosure. 12V and 220V versions are available for 10-15 EUR (Amazon) or $3-5 (AliExpress).

This box is designed to be mounted directly on an enclosure with M3 screws.

Print instructions

Print in PLA or PETG, 0.4 or 0.6 nozzle. No supports required.