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The Prusa CORE One/+ and Prusa CORE One L are enclosed printers with a door. It is necessary for the door to be closed for printing.
The closed door improves the print quality, but also ensures your safety, concerning possible injuries from the moving components.
To calibrate the door sensor position, navigate to LCD Menu -> Control -> Calibrations & Tests -> Door sensor calibration. An introductory message is shown on the screen, select Calibrate.
The printer prompts to first close the door. Once the door is closed, press Continue.
Then, the printer prompts to open the door, and gradually tighten the sensor tension screw. Tighten the tension bolt by half-turn for each iteration. After each adjustment, observe the door sensor switch emerging from the front profile hole.
Once tightened, press Continue. Follow the in-screen instructions, the printer can instruct to further tighten the tension screw, to loosen it, or to continue to a successive step.
When the printer prompts you, place your hand as shown in the screen picture below.
Once the sensor is calibrated, you should hear an audible click from the door sensor area when regularly opening and closing the door.
After the calibration, the status can be checked in LCD Menu -> Info -> Sensor Info -> Door Sensor.
By default, the printer has a safety feature that pauses printing if the door is open during a print.
In-screen message shown when a door is open during a print.
This feature can be accessed and toggled on or off by navigating in LCD Menu -> Settings -> Hardware -> Door sensor.