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setting home position


BROG
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Posted · setting home position

Even though the model is positioned in the centre of the build plate in Cura review, when I start the printer it moves over the the side and runs off the plate!!!! How do you reset the printer home position? does it have a relationship with the Cura review ?

Thanks

G

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    Posted · setting home position

    Yes, there is a relationship.  Check in Cura and see if "Origin at Center" is checked.  For most cartesian printers (rectangular build plates) the origin is in the left front corner and that box should be un-checked.  For delta type printers the origin is usually at center.

     

    So there is a relationship but it's platonic as neither Cura nor the printer have any idea where the build plate is in space.  They must be told.  Cura uses the "Origin at Center" check box and the build plate size "X(width)" and "Y(depth)" to describe the build plate and the Z(height) to make it a build volume.  The printer usually uses the end stop switches (auto-home location) coupled with the Home Offset position to determine where a gcode file should be placed in space.

     

    Cura builds the gcode locations around the 0,0,0 Origin.  When the printer reads the gcode file it puts those numbers around ITS 0,0,0 Origin.  That location must be must agree both in Cura and in the printer.

    You can check a gcode file by opening it in a text editor and looking at the beginning of the file for the lines:

    ;MINX:85.157
    ;MINY:99.699
    ;MINZ:0.2
    ;MAXX:144.845
    ;MAXY:130.301
    ;MAXZ:48

    In that example all the numbers are positive and my Ender 3 Pro prints in the "positive octant" so they are correct.  If I had checked "Origin at Center" then the numbers for that same slice would be something like:

    ;MINX:-29.834
    ;MINY:-15.301
    ;MINZ:0.2
    ;MAXX:29.834
    ;MAXY:15.301

    ;MAXZ:48

    Going a bit further, from the first example the midpoint of the model footprint is at "((MaxX - MinX)/2) + MinX" or X=115.00 and Y=115.00 which is the midpoint of my 230 x 230 bed.  In the second example the midpoint of the print is at MinX + MaxX or X=0 Y=0 and my printer would attempt to reach the negative numbers which would result in it moving to the left front corner and banging and clanging and spewing plastic and making awful noises while it tries to get to negative locations that it cannot.

    I have to stop now because the coffee is done.

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    Posted · setting home position

    Hi again Greg,

    I am a newby, and I put the second lot of gcode (-29.834 etc) into Cura but the printer ( Ender 3 ) still goes to the bottom left of the plate, runs two lines just inside the y axis, then tries to do the prinr commencing there as well!!! What am I doing wrong? I am sure the printer settings are not compatible but cannot seem to change them! The read out states "too far out"!!!

    HELP

    G

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    Posted (edited) · setting home position

    That is gcode generated by Cura and not part of your "StartUp G-Code".

    When you go to "Manage Printers" and "Machine Settings" is the "Origin at Center" box definitely NOT checked?

    What printer do you have?

    Please slice a calibration cube or benchy and post the gcode file here.

    Edited by GregValiant
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