Home Assistant

The Home Assistant integration exposes all Bambu Lab printers as devices in Home Assistant via MQTT Discovery — automatically, without manual YAML configuration.

Go to: https://localhost:3443/#settings → the Integrations → Home Assistant tab

Prerequisites

• Home Assistant running on the network
• MQTT broker (Mosquitto) installed and configured in Home Assistant
• 3DPrintForge and Home Assistant using the same MQTT broker

Enabling MQTT Discovery

1. Go to Settings → Integrations → Home Assistant
2. Fill in MQTT broker settings (if not already configured):
   • Broker address: e.g. 192.168.1.100
   • Port: 1883 (or 8883 for TLS)
   • Username and password: if required by the broker
3. Enable MQTT Discovery
4. Set Discovery prefix: default is homeassistant
5. Click Save and enable

3DPrintForge now publishes discovery messages for all registered printers.

Devices in Home Assistant

After activation, a new device per printer appears in Home Assistant (Settings → Devices & Services → MQTT):

Sensors (read)

Entity	Unit	Example
sensor.printer_nozzle_temp	°C	220.5
sensor.printer_bed_temp	°C	60.1
sensor.printer_chamber_temp	°C	34.2
sensor.printer_progress	%	47
sensor.printer_remaining_time	min	83
sensor.printer_filament_used	g	23.4
sensor.printer_status	text	printing
sensor.printer_current_file	text	benchy.3mf
sensor.printer_layer	text	124 / 280

Binary sensors

Entity	State
binary_sensor.printer_printing	on / off
binary_sensor.printer_error	on / off
binary_sensor.printer_door_open	on / off (X1C)

Buttons (actions)

Entity	Action
button.printer_pause	Pause ongoing print
button.printer_resume	Resume paused print
button.printer_stop	Stop ongoing print

Stop button

The stop button in Home Assistant cancels the print without a confirmation dialog. Use with caution in automations.

Automation examples

Notify on phone when print is complete

automation:
  - alias: "Bambu - Print complete"
    trigger:
      - platform: state
        entity_id: binary_sensor.printer_printing
        from: "on"
        to: "off"
    condition:
      - condition: state
        entity_id: sensor.printer_status
        state: "finish"
    action:
      - service: notify.mobile_app_my_phone
        data:
          title: "Print complete!"
          message: "{{ states('sensor.printer_current_file') }} is done."

Dim lights when print starts

automation:
  - alias: "Bambu - Dim lights during printing"
    trigger:
      - platform: state
        entity_id: binary_sensor.printer_printing
        to: "on"
    action:
      - service: light.turn_on
        target:
          entity_id: light.basement
        data:
          brightness_pct: 30

Energy monitoring

Combined with Energy monitoring, the following are also exposed:

• sensor.printer_power_watts — instantaneous power
• sensor.printer_energy_kwh — energy consumption for the ongoing print

See Energy monitoring for smart plug setup.