Missing part after slicing

[NosIreland]

Hi all,
For some reson after slicing I get missing parts in 3 d model. See pictures below:
Model

Sliced

Slic3r seems to work ok

Any explanation for this?

[brian442]

You are already tell just by looking at the model display in S3D that there are a lot of problems. Looks like lots of self-intersecting surfaces and backwards faces. So you can pretty much guarantee that this is not a valid solid model.

So I would say either fix the model in the original CAD package first or maybe try to use one of the free repair services (netfabb, makeprintable, etc).

[kabali16]

Looks like some triangles are flipped. Go to Repair menu, click on Flip surface orientation and select the face on the model that looks inverted. This should fix it. As a test, Click on View normals on the toolbar. All the Normals should be facing outwards.