marlin_i2/Marlin/example_configurations/Geeetech/Prusa i3 Pro B

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:

• ../GT2560/
• Marlin 1.1.4 With 3DTouch / BLTouch for i3 Pro B

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.