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Mechanical Endstops for Z Axis Alignment
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Remix of the Ender 3 sensorless homing spacer
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Remix of the original Ender 3 sensorless homing spacer for V roller gantry by @willsside
- Added electric wire slot to accommodate my in-frame LED strip mod connection.
- Adjusted the length to accommodate my z-axis lead screw anti-backlash POM nut mod (this reduced my Z range to about 215mm, but improves reliability)
Below is my working macro for mechanical gantry calibration (sensorless z-homing) in Klipper
[gcode_macro MECH_GANTRY_CALIBR]
gcode:
{% set z_max = printer.configfile.settings.stepper_z.position_max %}
{% set oldcurrent = printer.configfile.settings["tmc2209 stepper_z"].run_current %} ; TODO: Find runtime current settings
G28
G90
G0 X110 Y110 F8000
G0 Z205 F720 ; 12*60
SET_TMC_CURRENT STEPPER=stepper_z CURRENT=0.28
G4 P200
SET_KINEMATIC_POSITION Z=0 ; Fake Z position to allow move further
G0 Z13 F360
SET_TMC_CURRENT STEPPER=stepper_z CURRENT={oldcurrent}
G4 P200
G0 Z0 F360
SET_KINEMATIC_POSITION Z=205 ; Set Z-pos back (otherwise it would try to do z-hop and it is too high for that)
G28