Mhhh, my X20 is still under warranty (i think). I still have the standard size and the standard FB2 enclosure with a custom exhaust end (to my window). I always try to run the enclosure fan for about 1 or 2 minutes after the job finished before i open it. At moment I do this manually with the M7 command from the Lightburn console. With firmware build from source i had issues with the screen and WIFI i also have seen some strange messages from time to time. Was not really affecting engraving or cutting but i don’t feelt very save to use the firmware in this state and updated the source from ESP32_GRBL at least for the laser part. How did you modify the laser fan to control it?