Attached is a dry box/dehydrator implementation using ESP8266 (node mcu) , BME280 (sensor), Relay , 1602 Display. It is copy of code from various internet sources/programs/you tube but finally working. Please feel free to modify and integrate into Octoprint if suitable. It works as a standalone dry box control loop with output to MQTT server which interfaces with home assistant (IOT) and ESP web server (if you are interested in data trending)
BME sensor can be replaced by DHT11/22 if you may.
Attachment - Schematics
ThanksArchive.zip (298.2 KB)