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Z height with permanent printing plates


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Posted · Z height with permanent printing plates

hello .... can you install a function where you can set the z height in the menu a bit higher? especially for permanent printing plates it would be interesting so you could use the automatic active bedivelierung again .... had such a function on sigma ... you have the bed automatically leveled and then you could put it a little higher in the menu, this was synonymous then saved as a new z worth ....

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    Posted (edited) · Z height with permanent printing plates

    Hi, ok I think your solution is to use a Z-offset command. Printing uses absolute positioning and the z-offset command changes the physical position where the 0 absolute position is located. I think you are asking to bring your bed a bit closer to the nozzle when you say "a bit higher" ?


    You need to put your G92 z-offset command into your Start G-code. You will find your Start G-code in the printer settings. Go to Menu item Settings, then select Printer, then select Manage Printers. A list of printers will be displayed in a dialogue box, select your printer from the list displayed and then select the "Machine Settings" tab on the right-hand side.


    You will then get a dialogue box showing details of your printer and on the left hand side a box called Start g-code. This is where you enter your command. You need to do your positioning in relative mode, i.e. relative to the z axis position when this command is processed. So


    G91              ;set relative positioning

    G92 Z+0.050       ;set z-offset to move bed closer to nozzle by 50 microns

    G90              ;return to absolute positioning


    This assumes you want the move to be 50 microns


    Oh, if the dialogue box already has g-code in the Start gcode box then best if you post it here, before doing anything. Especially if it has G90,G91 or G92 codes


    IMPORTANT: This is very important. I think G92 Z0.050 moves the bed away from the nozzle and G92 Z+0.050 moves the bed towards the nozzle, but I am not certain. I have only used the G92 command withabsolute positioning and the Reprap paper on commands I am looking at, does not comment on negative vs. positive positioning when using relative positioned commands.


    Hopefully someone on the Forum can give a definitive answer. 


    Anyway I will advise you to test this. 

    I assume your gap between the bed and nozzle is 0.1mm and so I chose 0.050mm as being midway. 

    After the G90 command enter the command for an emergency stop -  M112

    This works with most firmwares but not Sprinter; I do not know what firmware you have.


    Before running the g-code, slide a piece paper between the bed and the nozzle, you should feel some slight friction.

    Run the gcode and check again; you should feel an increased friction; if you feel nothing then the codes are the wrong away around - the bed has moved away from the nozzle.


    And finally change the 0.050 measurement to what you want.





    Edited by yellowshark
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