We're working on a prototype right now of the new 4-pin PWM 12V Fan controller added to the existing touchscreen temp/voc logger product. You can either control the fan speed manually, shown below, or use the "auto" button to keep the enclosure temperature from going higher than a set level. (The case is a prototype and still has some glue on it, sorry.)
Before this feature was added we had to manually adjust the fan inside the air filter to keep ABS prints in the sweet spot, but this will make things a lot easier. For example, in the past the temp inside the enclosure could get too high and the CPU attached to the print head in the 5H PrusaXL would overheat and shut down the print.
This feature is designed to work with any 4-pin PWM 12V fan. For our testing, though, its controlling the fan inside our 120mm carbon filter.
