Empty space in model shows up with infill when exported as .stl

[Anonymous]

Is there something I need to do to prep a model before I export it as a .stl. I have a simple shape I made:

When I try to export this as a .stl to print in S3D the empty center space shows up with infill and it prints a top layer over the whole thing.

All i did was a couple of sketched circles and extruded faces.

[Anonymous]

The best I can tell the slicer software is trying to print a solid layer over the top of the cylinder when it is done. I'm not sure how to designate the middle of my cylinder as voidspace or make sure there isnt a face on the top of the cylinder that I cant see.

[schneik-adsk]

can you show a shot of the model in simplify3d without the toolpath preview?

[Anonymous]

The weird thing is I tried leaving it on it's side and it try to cap the top.

[Anonymous · Accepted solution]

I re-did my sketches with sketchup and ended up with the same infill issue, so the problem must lay in the slicer software.

[rotaccz]

Happened to me too. The reason was the Simplify3D Advanced setting: Advanced -> Merge all outlines into a single solid model.

Once disabled, the problem disappered. Makes sense, after all.