Testing a Bltouch, CRTouch, ora clone in Klipper

Testing a BLTouch with Klipper involves several steps to ensure that the probe is functioning correctly. Here’s a simplified process:

1. Initial Setup: Make sure the BLTouch is correctly mounted and the pin is about 2 mm above the nozzle when retracted (1).

2. Self-Test: Power on the printer; the BLTouch should perform a self-test, moving the pin up and down. After this, the pin should retract, and the red LED should light up (1).

3. Control Pin Test:

   • Send BLTOUCH_DEBUG COMMAND=pin_down in the printer terminal to move the pin down.

     BLTOUCH_DEBUG COMMAND=pin_down
     

   • Verify that the red LED turns off.

   • Send BLTOUCH_DEBUG COMMAND=pin_up to retract the pin and ensure the red LED turns on (1).

     BLTOUCH_DEBUG COMMAND=pin_up
     

4. Sensor Pin Test:

   • With the pin down, send BLTOUCH_DEBUG COMMAND=touch_mode, then QUERY_PROBE and check for “probe: open”.

     BLTOUCH_DEBUG COMMAND=touch_mode
     

     &

     QUERY_PROBE
     

   • Gently push the pin up with your finger, send QUERY_PROBE again, and look for “probe: TRIGGERED”.

   QUERY_PROBE

   
   - If the responses are incorrect, check your wiring and configuration (1).
   

5. Probing Test: Move the print head away from the bed and repeat the control and sensor pin tests to confirm the probe’s response when not near the bed surface (1).

Remember to handle the BLTouch probe gently and avoid touching the pin with your fingers, as it’s sensitive to grease and pressure. If you encounter any issues during these tests, it’s usually a sign to double-check your wiring and configuration settings¹. Always refer to the official Klipper documentation for detailed instructions and troubleshooting tips. Happy printing!

References: (1) BL-Touch - Klipper documentation. (2) Klipper & BLTouch: How to Make Them Work Together | All3DP. (3) Testing the BLTouch - MatterHackers Knowledge Base (4) klipper/docs/BLTouch.md at master · Klipper3d/klipper · GitHub