Homing is required before G29, M48, and some other procedures.. The home position on a CNC machine is a static, repeatable position. G28 disables bed leveling. This will let you adjust the Z to a negative number for your offset. Reason is simply to cause no collisions. In the case of the Ender 3, the chip used sadly disqualified Repetier firmware, so writing it yourself is the only option. Sounds simple, but what if are by accident near the top. If homing is needed the LCD will blink the X Y Z indicators. You can also specify which exact axes you want to home by adding an X, Y, or Z to the command. Having trouble getting your prints to stick? Make a note of the total of 1mm steps made for the home offset value. Notes. There's no way to do it, without extra hardware - either physical or electronic. If you have a z max end stop as well, that would catch the up move simply by triggering and you are safe. Follow with M420 S to turn leveling on, or use RESTORE_LEVELING_AFTER_G28 to automatically keep leveling on after G28. Hier relevant vermutlich: Ender 3 mit MKS Gen L, TMC2208, BLTouch v3, Marlin 1.1.9. Der BLTouch ist an einem Petsfang links montiert, trifft also bei klassischem Homing nie das Bett. Add 2 // in front of the MIN_SOFTWARE_ENDSTOP_Z line in your Configuration.h file as shown below. Want to print on top of an existing object? To get these, connect the printer via USB, connect it with a software like Repetier host and send M503 to … including homing.. Ie homing Z should not move X or Y ... Maybe a video? Arguments: If no arguments are provided, the machine will home all 3 axes. // // With this feature enabled: // // - Allow Z homing only after X and Y homing AND stepper drivers still enabled. To write the firmware yourself or using Repetier firmware, you need the old settings. This is also a useful way to quickly move one axis out of the way, which may be useful at the end of a print so that you can remove your part. 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). G28 – Perform Homing Routine. // - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28). #define HOMING_FEEDRATE_Z (8*60) #define EEPROM_SETTINGS. Keep a count of how many 1mm steps, and stop when you get the nozzle about 1 to 2mm away from the platform. January 2017 you can set homing to raise z before homing. // - If stepper drivers time out, it will need X and Y homing again before Z homing. You will need to make sure software endstops are DISABLED for Z after adding the probe. Going Home. 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