Filament Dryer

_{Filament Dryer}

Key info

• Heating: 3× heating mats (24V), total 250W, with radiators/heatsinks -> max temp. 70°C
• Control: ESP32-C3 + MOSFET modules, PID control with PWM
• Power rails: 24V (mats), 12V (fan + LEDs), 5V (ESP32) via DC-DC step-down converters
• Sensors: DS18B20 1-wire sensors attached to the mats (over-temp safety shutdown) + chamber temperature BMP280 & humidity AHT10 sensor (used for control)
• UI: LCD 16×4 + buttons for setpoint/status
• Drying timer: built-in timer to set the drying duration
• Fan control: fan PWM adjusted based on humidity inside the dryer

Operation

• Set drying temperature and drying time (timer)
• Live preview of all key values on the LCD:
  • readings from all sensors
  • PWM duty cycle (heater/fan)
  • current system status (heating/holding/safety state)

Planned features

• Communication with a server via MQTT
• Multiple operating modes (presets / profiles)
• Remote programming / updates for the ESP32 (OTA)

Components

• ESP32-C3
• 3× MOSFET module
• 3× step-down converter
• 3× DS18B20
• 1× AHT10
• 1× BMP280
• LCD 16×4
• Buttons (menu) + ON/OFF switch
• Prototype board
• LED strip
• Wires
• Power supply (250W)
• Heating mats
  • 2× 100W / 24V
  • 1× 50W / 24V
• XT60 connector
• Fan 120mm
• 3× radiator/heatsink
• 1kg PETG
• Plexi 300x300

Safety

If any heating mat temperature exceeds the defined limit, the heater is turned off automatically.