Having trouble getting your prints to stick? The home position on a CNC machine is a static, repeatable position. // - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28). #define Z_SAFE_HOMING. If homing is needed the LCD will blink the X Y Z indicators. Sounds simple, but what if are by accident near the top. Arguments: If no arguments are provided, the machine will home all 3 axes. For true homing to work, the machine needs to have a set of switches on each axis that can be triggered by an object that does not move (such as an end plate or side plate of the frame). Make a note of the total of 1mm steps made for the home offset value. // // With this feature enabled: // // - Allow Z homing only after X and Y homing AND stepper drivers still enabled. If you have a z max end stop as well, that would catch the up move simply by triggering and you are safe. With the Z axis at zero position, as in Step 3. c, use the Z axis manual jog control to bring the hot end nozzle closer to the build platform in 1mm steps. G28 – Perform Homing Routine. There's no way to do it, without extra hardware - either physical or electronic. This will let you adjust the Z to a negative number for your offset. Add 2 // in front of the MIN_SOFTWARE_ENDSTOP_Z line in your Configuration.h file as shown below. Reason is simply to cause no collisions. You can also specify which exact axes you want to home by adding an X, Y, or Z to the command. One (crude method) is to have a mechanical end stop - and your program simply hammers the motor against the endstop more times than it will ever need to - the Commodore C64 disk drive did this, hammered the head against the endstop 256 times (for a maximum 40 or 80 track disk). Follow with M420 S to turn leveling on, or use RESTORE_LEVELING_AFTER_G28 to automatically keep leveling on after G28. // - If stepper drivers time out, it will need X and Y homing again before Z homing. The Z axis moves up for positive moves and down for negative moves. Keep a count of how many 1mm steps, and stop when you get the nozzle about 1 to 2mm away from the platform. Want to print on top of an existing object? Hier relevant vermutlich: Ender 3 mit MKS Gen L, TMC2208, BLTouch v3, Marlin 1.1.9. Homing is required before G29, M48, and some other procedures.. To write the firmware yourself or using Repetier firmware, you need the old settings. G28 disables bed leveling. #define HOMING_FEEDRATE_Z (8*60) #define EEPROM_SETTINGS. If you have no z max end stop just make sure never to move that much up. Der BLTouch ist an einem Petsfang links montiert, trifft also bei klassischem Homing nie das Bett. Try using Z offset to adjust where your 3D printer starts printing. 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