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README.md

README.md

These are example configurations for the low-cost Acrylic Prusa I3 pro B 3D Printer DIY kit and the 3DTouch auto bed leveling sensor based on:

The main characteristics of these configurations are:

  • The defined motherboard is BOARD_GT2560_REV_A_PLUS.
  • Travel limits are adjusted to the printer bed size and position.
  • An example SKEW_CORRECTION for a particular printer is enabled. See comments below about how to adjust it to a particular printer.
  • Using the LCD controller for bed leveling is enabled.
    • PROBE_MANUALLY is enabled, which provides a means to do "Auto" Bed Leveling without a probe.
    • The LEVEL_BED_CORNERS option for manual bed adjustment is enabled.
    • Bilinear bed leveling is enabled, the boundaries for probing are adjusted to the glass size, and extrapolation is enabled.
  • PRINTCOUNTER is enabled, in order to track statistical data.
  • INDIVIDUAL_AXIS_HOMING_MENU is enabled, which adds individual axis homing items (Home X, Home Y, and Home Z) to the LCD menu.
  • The speaker is enabled for the UI feedback.
  • bltouch variant:
    • USE_ZMAX_PLUG is enabled. See comments about connections below.
    • Heaters and fans are turned off when probing.
    • Multiple probing is set to 3.

First-time configuration

Skew factor

The skew factor must be adjusted for each printer:

  • First, uncomment #define XY_SKEW_FACTOR 0.0, compile and upload the firmware.
  • Then, print YACS (Yet Another Calibration Square). Hint, scale it considering a margin for brim (if used). The larger, the better to make error measurements.
  • Measure the printed part according to the comments in the example configuration file, and set XY_DIAG_AC, XY_DIAG_BD and Y_SIDE_AD.
  • Last, comment #define XY_SKEW_FACTOR 0.0 again, compile and upload.

3DTouch auto leveling sensor

  • Print a suitable mount to attach the sensor to the printer. The example configuration file is adjusted to http://www.geeetech.com/wiki/images/6/61/3DTouch_auto_leveling_sensor-1.zip
  • Unlike suggested in geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor, the existing end stop switch is expected to be kept connected to Z_MIN. So, the sensor is to be connected to Z_MAX, according to Marlin's default settings. Furthermore, GT2560-A+ provides a connector for the servo next to thermistor connectors (see GT2560 and GT2560-A+).
  • Be careful to respect the polarity of the sensor when connecting it to the GT2560-A+. Unlike end stops, reversing the connection will prevent the sensor from working properly.
  • Test and calibrate the sensor.
  • If using the GT2560-A+ and with the sensor connected to Z_MAX and an endstop connected to Z_MIN use the following calibration routine instead.

3DTouch Calibration with Z_MAX

  • Home the printer with G28 command.
  • Disable the Z axis software endstop with M211 S0 Z0
  • Reset the probe Z_OFFSET with M851 Z0
  • Move to the center of the bed with G1 X100 Y100
  • Move Z incrementally until the nozzle is the correct height from the bed using a shim or piece of paper, record this Z movement, for example -0.2.
  • Do a single probe at the current point in the middle of the bed using G30 and not the returned value, for example 1.9. Invert this value, i.e. -1.9, and add it to the Z offset above, i.e. -0.2 in this example giving -2.1.
  • Update the probe Z_OFFSET to this value using M851 i.e. M851 Z-2.1.
  • Re-enable software end-stops with M211 S1 Z0
  • Save this value to the EEPROM with M500.
  • Update the start G-Code in your slicer software to insert a G29 after the last G28.
  • Carefully test that the offset is correct in the first print.