Step 1: How the Door Sensor Works
The door sensor is a magnetic switch mounted inside the top-right frame that detects whether the printer door is open or closed by engaging when the door presses the internal trigger and signaling the printer to respond—such as pausing or notifying—when the switch is released, while not automatically closing the door itself.


Step 2: Benefits of the Door Sensor
The door sensor helps maintain proper chamber temperature for materials like ABS, reduces heat-creep risk when printing cooler filaments by allowing controlled door positioning, and minimizes noise by keeping the enclosure closed, with the feature enabled manually through Bambu Studio or the printer’s LCD.

Step 3: Activating the Door Sensor in Bambu Studio
Open Bambu Studio, navigate to the Device section, select Print Options, and enable the Open Door Detection checkbox to activate the door sensor feature.


Step 4: Activating the Door Sensor Using the LCD Screen
Open the Settings menu, select Print Options, scroll down to Open Door Detection, and enable the checkbox to activate the feature.

Step 5: Open Door Detection Settings
When Open Door Detection is enabled, you can choose between Notification and Pause Printing; with Notification selected, the printer displays a warning, error code, and QR code on the touchscreen if the door is opened during a print, alerting you without pausing the job.

Step 6: Pause Printing Option
When Pause Printing is selected, the printer automatically pauses if the door is opened and displays a message offering three choices—Resume to continue the print, Stop to end it, or Check Assistant to view the notification page and scan the QR code for more information.

Step 7: Door Sensor Not Working – Possible Causes and Solutions
If the door sensor does not respond after activation, a common cause is outdated firmware; update to the latest version by opening the Settings menu, selecting Firmware, reviewing the version history, and clicking Update if a newer version is available.

Step 8: Additional Causes — Door Switch Placement, Wiring, and Sensor Faults
A loose door switch can fail to align with the door and prevent proper triggering, so ensure its single mounting screw is secure; faulty or poorly seated wires can interrupt detection, so verify both wires are fully inserted and undamaged; and if the switch itself is defective, the sensor will not register door movement and must be replaced.