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Strange slicing error

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I printed the OpenDive vr goggle by Stefan Welker (also an Ultimaker user).


Strangely the .stl file containts the logo but the .gcode has left half of it out. In Cura's normal preview the logo is intact. The layers preview shows the broken logo. Otherwise the object is fine. Just wondering how it happened.

Print settings:


  • Layer height: 0.2
  • Shell thickness: 0.8
  • Bottom/Top thickness: 0.6
  • Fill Density: 30
  • Speed: 70
  • Temperature: 220
  • Minimal layer time: 5

Didn't touch other settings in Cura. Here is the .gode file:


Here is a preview of the .stl file in Netfabb and .gcode in Repetierhost.

opendive Stl

opendive gcode

opendive cura


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I just sliced it again and the problem is gone. Weird.


I don't believe it. You changed something.

Anyway I've seen similar problems. Text is usually added to the CAD late and they don't always do it right so that you have all kinds of edges/walls to the text *inside* the model. This kind of thing is fixed with the "fix horrible" settings.


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No I didn't - I swear. And I didn't check the fix horrible setting.

I suspect it hast something to do with shell thickness. If it is to small, the text would be "sliced away". Maybe a calculation in Cura went wrong or it was borderline to a value that would slice away the text.


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look at it in xray view. If you see *any* red then you cad model is illegal. You can fix it or you can experiment with the "fix horrible" settings. There are 11 combinations of those settings to try. (don't do A *and* B as it is the same as B).


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