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I'm brand new to using Blender, and I'm trying to teach myself some basics to use in conjunction with 3D printing. To do that I'm trying to 3D print a plate with a logo on it. However, I'm having an issue with one single letter in the logo showing up as "negative" space after slicing the model in the 3D print software (Repetier-Host).

I'm lost on why this is happening or where in the process I'm messing up? The only thing I notice that is strange is that the shadowing for the letter in Blender looks a little different from the surrounding parts (and its more noticeable when input into the print software). In Blender and Repetier-Host that specific letter still looks extruded, even though the shadowing is strange (less shadowing, i guess), and its not until the model gets sliced does it become "negative".

And it's not like each letter in the logo was uploaded separately. The entire logo was a single PNG file originally and converted to a SVG file through Inkscape. So why this specific letter is behaving differently is very confusing?

And FYI...when making the file Blender file I appended the logo (previously extruded) with a plate part to create the file full part.

Anybody have any thoughts or experiences with something like this?



marked as duplicate by gandalf3, David, Ray Mairlot, iKlsR Sep 4 '14 at 1:22

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  • $\begingroup$ Could you upload a .blend file? $\endgroup$ – PGmath Sep 3 '14 at 17:48

The part about the shading looking slightly different sounds like the normals are flipped. To flip a face's normal, select the face(s) in edit mode and hit CTRL F, then select flip normals.

Here is the documentation on normals, at the bottom of the page.

  • $\begingroup$ PGmath...that appears to be what the problem was. I took your suggestion and made the change to that specific letter, and it looks great now. Thanks so much for the help. Not sure why that one letter had a backwards normal like that, but I'll definitely be more aware of that possibility in future. $\endgroup$ – Brian Sep 3 '14 at 18:02
  • $\begingroup$ @Polosson where did you get the button characters you added to my answer? $\endgroup$ – PGmath Sep 3 '14 at 18:17
  • $\begingroup$ you just have to add the <kbd></kbd> tags around it. Click the "Edit" button to see what I mean. $\endgroup$ – Polosson Sep 3 '14 at 18:24
  • $\begingroup$ Note that you can also flip the normals with Ctrl+Shift+N $\endgroup$ – gandalf3 Sep 3 '14 at 18:44

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