Once you leveled with the paper, you do not need to create an offset to account for the paper thickness, however, there are purists that do that. In Marlin, there are a few bug-fixing programming lines for the BLTouch Z offset and, in unchanged Marlin, these are in pseudocode (“//”). You can use use Z-Offset to change the Z Height using M851. Maybe the solution would be: My z probe offset for bltouch is -2.7, after homing Z sits at 17.7, but when it prints it prints in the correct place. Using the Creality BLTouch Kit bracket, mine is { -43, -9, 0 }. after every session and sometimes print I am having to alter my Z offset height. The Z-axis offset, or Z-offset for short, is the distance from the top of the heated bed washers (defined as “zero”) to the tip of the hot end nozzle. Check the Z position on the printer screen, and subtract another 0.1 from this value to account for the thickness of the paper. Marlin understands Gcode commands to set the Z offset. All you have to do is remove the “//” in front of the programming lines below, which can be found in the Configuration.h file, and then rebuild and reinstall your new Ender 3 firmware . Z offset = -1.4mm Control > Motion > Z offset and enter the value obtained above e.g. Instructions are in the comments. Having have a thumb screw on my Z-Axis sensor allows this adjustment to be made very quickly. -1.4 in this example Control > Store memory Fine tuning – after initial setup. I usually use optical infrared sensors for my printers, but I wanted to try the BLTouch sensors since none had fallen yet by my hands. The image below shows you my Whole bed is covered in 1 strip of Paper Tape. You’ll need to customize the offset between Probe and Extruder. :x: Z-endstop switch is NOT monitored while homing Z.:heavy_check_mark: BLTouch is deployed while homing Z.:heavy_check_mark: BLTouch is monitored while homing Z.:heavy_check_mark: Z-endstop switch is monitored when moving Z axis down via LCD menu or G0. Option ? Reply Quote // - Allow Z homing only after X and Y homing AND stepper drivers still enabled // - If stepper drivers timeout, it will need X and Y homing again before Z homing // - Position the probe in a defined XY point before Z Homing when homing all axis (G28) // - Block Z homing only when the probe is outside bed area. The "paper drag" method is perfect for determining the correct Z level. #ifdef Z_SAFE_HOMING or Marlin has access to the Z-Offset from the LCD allowing quick setting of the desired offset height. The only issues I had with the above process is it can get confused if you do some of it on the control panel and some of it on a tethered PC/octoprint, as … I am using EZABL and run G28,G29 I have read somewhere that there was a bug within Marlin i thought this had been fixed in the latest version. In Marlin 2.x, they’re now combined in NOZZLE_TO_PROBE_OFFSET. I have run out of ideas. Recently a colleague sent me a BLTouch / 3DTouch sensor from the Geeetech brand. So I got down to work for Configure BLTouch with BabyStepping in the last Marlin available today and satiate my curiosity.. You can not only change the Z offset in the slicer or in the configuration of Marlin, but also with G-code commands. This will be your new Z-Probe Offset value; Set the nozzle temperature back to 0 with M104 S0; Set your new Z-Probe Offset using M851 Z, for example M851 Z-2.2; Re-enable the soft movement limits using M211 S1 In Marlin 1.x, this was done with X, Y, and Z_PROBE_OFFSET_FROM_EXTRUDER. 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