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3D_TOUCH

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MKS-Sean edited this page Feb 23, 2021 · 5 revisions

Hardware connection

  • 3D TOUCH or BLTOUCH connect to motherboard BLTOUCH interface, you need to pay attention to the 5V, GND S signal sequence
  • About more information, you can refer to 3D Touch bltouch tutorial

How to buy

Video Tutorials

Measure probe to nozzle offset

  • Refer to video tutorials for measurement method

  • The position of the probe in the coordinate system with the nozzle as the origin

  • Z value shall be accurate, and can be adjustment by z-offset

Connect motherboard

  • 3D Touch work with z-axis endstop:

    • 3D TOUCH's 3PIN connect to Bltouch interface
    • 3D TOUCH's 2PIN connect to Z+ interface

  • 3D Touch replace z-axis endstop:

    • 3D TOUCH's 3PIN connect to Bltouch interface
    • 3D TOUCH's 2PIN connect to Z- endestop interface

Firmware setting

  • 1.Enable BLTOUCH for 3D Touch

    • Configuration.h： #define BLTOUCH

  • 2.Enable AUTO_BED_LEVELING_BILINEAR

    • Configuration.h： #define AUTO_BED_LEVELING_BILINEAR

  • 3.Enable and set SERVOS number

    • Configuration.h： #define NUM_SERVOS 1

  • 4.Set pin port for servos

    • pins_MKS_ROBIN_NANO_V3.h： #define SERVO0_PIN PA8

  • 5.Enable EEPROM_SETTINGS for store parameters

    • Configuration.h： #define EEPROM_SETTINGS

  • 6.Set endstop inverting type for 3D touch

    • Configuration.h： #define Z_MIN_PROBE_ENDSTOP_INVERTING false

  • 7.Set pin port of 3D touch connection

    • Configuration.h：#define Z_MIN_PROBE_PIN PC4 //Z-MAX

  • 8.Set probe to nozzle offset to measurement before

    • Configuration.h：#define NOZZLE_TO_PROBE_OFFSET { 10, 10, 0 } //Measure probe to nozzle offset

  • 9.Set distance between probe and the edge of the hotbed to prevent the probe from exceeding the hotbed

    • Configuration.h：#define PROBING_MARGIN 10

  • 10.Enable leveling range

    • Configuration_adv.h
    #if PROBE_SELECTED && !IS_KINEMATIC
  #define PROBING_MARGIN_LEFT PROBING_MARGIN
  #define PROBING_MARGIN_RIGHT PROBING_MARGIN
  #define PROBING_MARGIN_FRONT PROBING_MARGIN
  #define PROBING_MARGIN_BACK PROBING_MARGIN
#endif

  • 11.Set the number of grid points 3*3

    • Configuration.h：#define GRID_MAX_POINTS_X 3

  • 12.Add "set_bed_leveling_enabled(true);" at the end of file:"src -> gcode -> calibrate -> G28.cpp" set_bed_leveling_enabled

3D Touch replace z-axis endstop

  • According to the "3D Touch replace z-axis endstop" requirements Connect motherboard

  • Firmware setting(after normal firmware setting)

    • Configuration.h
      • Enable: #define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
      • Enable: #define Z_SAFE_HOMING
      • Disable: //#define Z_MIN_PROBE_PIN PC4 //Z-MAX

Adjust Z offset

  • Z offset is required accurate,the measured value may not be accurate enough, so Z offset adjustment is needed
  • If the distance between nozzle and hotbed is too large, Z offset (negative) need increase, such as: - 0.68 -- > - 1.25
  • If the distance between nozzle and hotbed is too small, Z offset (negative) needs to be reduced
  • After adjustment, store settings, load settings ,and test again
  • Test several times to ensure that the value of Z offset is appropriate

How to use it

  • After a successful autolevel, save parameters, no need level again
  • After using for a period of time, if there is a leveling problem, can be autolevel and save parameters again
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