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Posted · number of layer

[i deleted your "repair" post as I think you fixed things already, right?  If not, then I apologize]

 

In cura at the top is PREPARE and then PREVIEW.  Always look at your part in PREVIEW mode after slicing and move the slider on the right side.  You can count the layers here without wasting time printing.  You can change a setting in cura and reslice and see what is happening in seconds rather than waste time printing a failure.

 

4mm/0.2mm = 20 layers.  So you got the perfect result?

 

I think maybe your question is wrong.  I think you expected 20 layers but got 19 layers?  This makes sense.  The first layer is usually thicker (defaults to 0.3mm or 0.27mm depending on printer type).  You can change the first layer in the cura setting: "initial layer height".  Set that to 0.2mm (or maybe 0.199mm) and now you should get exactly 20 layers.

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    Posted · number of layer

    Check two things.  Click on the part and on the left side of the screen click on the "move tool" (to allow you to move the part up/down/left/right).  Look at the Z value.  Make sure it is zero.  Looking at your screen shot it looks to me like Z is a negative value which would explain your situation.

     

    Also click on the scale tool to see how tall your print is to verify that cura thinks it is 4mm.

     

    Finally - it could be a rounding error - change your initial layer to 0.19mm.

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    Posted · number of layer

    I found reason, Slicing Tolerance = 'Exclusive' :-(. For 'Middle' or 'Inclusive' it is ok.

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    Posted · number of layer

    A few months ago there was a long discussion (either here or on GitHub) regarding Slicing Tolerance.  I think the consensus was to use Middle as there were confusing issues with the other two.  You seem to have found one - but it wasn't the only one.

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