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Z-axis accuracy


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Posted · Z-axis accuracy

Hi all,


I have a print going, the second time around on these parts, and for some reason the material moves outward on the vertical face.  This should be a perfectly smooth surface.  It looks like the print running now has the offset at the same spot it was the last time I ran these.  Any idea why this might be happening?  Thanks in advance!




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    Posted (edited) · Z-axis accuracy

    So I am currently dealing with this issue however it is not nearly as severe. After hours of research, Ive yet to conclusively come up with a solution but I am still working on it. Ill break my theories into two categories, mechanical issues and settings issues.  After looking at your pictures, Im leaning more towards it being a loose belts. If anyone has anymore to add or would like to correct me if I said anything wrong then please do!



    • Temperature fluctuations
      • Fluctuations in temperature can cause the filament to come out at varying stages of fluidity.
      • You can see if this is what is happening by looking at the print core temps while printing.
    • Printing too fast
      • If you do have loose belts and are printing fast then there is an increase in likelyhood that these mechanical issues will start to affect your quality. Slow it down and see if that makes a difference.
      • Try to reprint it with the infill speed, outer wall speed, and inner wall speed all set to the same value. Maybe 30mm/s.
    • Flow rate may need to be tuned.
      • Print a square with 1 wall, no infill, and no top/bot layers. Measure the wall with a caliper and you should get the value you have set for your line width. If you aren't getting that value then find a flow calculator online and it will tell you the value you need.


    • Z axis screw not clean/lubricated properly.
    • Inconsistent filament diameter
      • Any fluctuations in diameter of the filament can cause inconsistent extrusions
    • Belts too loose.
    • Linear rods not lubricated.
      • Should be done monthly after the first year.
    • Bad bearing on one of the axis
      • This one is unlikely but still possible.
    • Bad PCB on print core which causes temperature fluctuations
      • Also pretty unlikely but possible
    Edited by Jhawk6553
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