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Scaling factor shrinkage compensation under


tombmatt
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Posted · Scaling factor shrinkage compensation under

i was trying to set a percentage for deminsion accuracy found "Scaling factor shrinkage compensation" under Preferences, settings, material, howerver it has a note that states "this setting has beenbeen hidden by the active machine and will not be visible. So i added a different machine since i couldn't erase the only machine i had. the new machine had the same note attached so i deleted cura and reinstalled, with no printer set up on a fresh install i still have the same note so i assume (i know assumptions etc) it is a feature that is not actually programed for? or is it? does anyone have a work around?

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    Posted · Scaling factor shrinkage compensation under

    You can scale the model in Cura.  If shrinkage is 8% then scale the model up 8% and then slice it.

    If you de-select "Uniform Scaling" you can set each axis to a different scale factor.  That could be useful if (for example) you found that a particular infill caused the Z to shrink differently than the X and Y.

    You could also scale the steps/mm of the X, Y, and Z with an M92 line in the beginning of a Gcode file.  Without an M500 to save the changes, they would return to your default values when the printer cycled on and off.  Not all printers allow that though.

    You could scale the model up in the native design software before exporting the STL file and then use the Undo function to negate the change.

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    Posted · Scaling factor shrinkage compensation under
    12 hours ago, tombmatt said:

    i was trying to set a percentage for deminsion accuracy found "Scaling factor shrinkage compensation" under Preferences, settings, material, howerver it has a note that states "this setting has beenbeen hidden by the active machine and will not be visible. So i added a different machine since i couldn't erase the only machine i had. the new machine had the same note attached so i deleted cura and reinstalled, with no printer set up on a fresh install i still have the same note so i assume (i know assumptions etc) it is a feature that is not actually programed for? or is it? does anyone have a work around?

    It's still disabled because it's not done yet.

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    • 1 year later...
    Posted · Scaling factor shrinkage compensation under
    On 11/1/2020 at 11:11 PM, GregValiant said:

    You can scale the model in Cura.  If shrinkage is 8% then scale the model up 8% and then slice it.

    If you de-select "Uniform Scaling" you can set each axis to a different scale factor.  That could be useful if (for example) you found that a particular infill caused the Z to shrink differently than the X and Y.

    You could also scale the steps/mm of the X, Y, and Z with an M92 line in the beginning of a Gcode file.  Without an M500 to save the changes, they would return to your default values when the printer cycled on and off.  Not all printers allow that though.

    You could scale the model up in the native design software before exporting the STL file and then use the Undo function to negate the change.

    Scaling does work well. Print a cube of known size, measure it precisely, scale it by the shrinkage factor you calculated, print, measure. 

    Repeat if the scaled up print is off by unacceptable margin.

     

    Problem is you must do this for every time and for new model placed on the plate.

     

    Why not tie the shrinkage factor to material profile and have Cura compensate automatically?  

    Adding this feature would indicate Cura is not just for printing toys where tolerances do not matter that much.

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