Servo Optical Auto level for FlyingBear P905x

thingiverse

Bed Auto level sensor for FlyingBear P905x After the original sensor burned down, I decided to redesign it to be compatible with the glass bed. The design has been improved significantly. The shaft is a 3x57mm steel bar, recycled from the rotor of a Trex 450 helicopter. This design includes the sphere that the servo uses to raise it, and any 3mm shaft can be used. An o'ring has also been added for better durability. The LED next to the sensor is only for debugging purposes and is completely unnecessary. The optical sensor is recycled from an old HP printer. However, there are many commercial options with Photo-interrupters available. In my case, I had to reverse the Marlin logic for the Z axis. #define Z_MIN_ENDSTOP_INVERTING true And disable all endstop pullups by commenting on this line: //#define ENDSTOPPULLUPS Then activate all the pullups except the one in the Zmin: #if DISABLED(ENDSTOPPULLUPS) #define ENDSTOPPULLUP_XMAX #define ENDSTOPPULLUP_YMAX //#define ENDSTOPPULLUP_ZMAX #define ENDSTOPPULLUP_XMIN #define ENDSTOPPULLUP_YMIN #define ENDSTOPPULLUP_ZMIN //#define ENDSTOPPULLUP_ZMIN_PROBE #endif Other changes in Marlin FW: #define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN #define Z_ENDSTOP_SERVO_NR 0 #define Z_SERVO_ANGLES {50,160} // You must test these angles with M280 command(M280 P0 S50)(M280 P0 S160), S128 is the servo center #define Z_HOMING_HEIGHT 3 #define Z_CLEARANCE_DEPLOY_PROBE 9 #define Z_CLEARANCE_BETWEEN_PROBES 9 #define Z_MIN_PROBE_REPEATABILITY_TEST #define AUTO_BED_LEVELING_4POINT // With glass bed I think 4 points is enough #define Z_SAFE_HOMING #define HOMING_FEEDRATE_Z (8*60) #define NUM_SERVOS 1 #define SERVO_DELAY { 1200 } #define DEACTIVATE_SERVOS_AFTER_MOVE #define X_PROBE_OFFSET_FROM_EXTRUDER -20 #define Y_PROBE_OFFSET_FROM_EXTRUDER -55 Video is HERE: https://www.youtube.com/watch?v=qamYyHy4Yus