Any version, holes in sliced object

[justmyopinion]

Tested with v1.1.3 and earlier versions. W7/x64
STL file: https://github.com/RichRap/3DR-Delta-Printer/blob/master/stl/3DR_Top_Electronics_Mount_V2_001_RTP.stl
Default config or any.

Some strange holes appear in sliced file not seen in STL file, which reports no errors.

[whosawhatsis]

The wall in this spot is less than .35mm thick, so this is probably the expected behavior.

[justmyopinion]

@whosawhatsis
Sounds interesting, but where did you locate that spot? cant recognize anything similar on the STL file visualization (Repetier)

[whosawhatsis]

I sliced across the hole you were seeing in the gcode preview. This is a cross-section, with the red areas showing the inward-facing sides of the facets.

[justmyopinion]

But this is what I see from STL preview: is this showing wrong?

[whosawhatsis]

This is how I cut it to get that view:

The problem is that the rectangular hole with the two cylinders in it gets wider below the rim, which is only uniform width at the top.

[justmyopinion]

Ok now I see what you mean :-(.
I assume a lot of people are printing these, how do they cope with this?
Thruly a bad design.
Thankyou @whosawhatsis for taking your time.

[whosawhatsis]

"Truly bad" is probably an overstatement. It's an imperfect design. You should report it on his repo (linking back here for details) so it can be fixed.

[justmyopinion]

Thankyou, I am closing this one.

[alranel]

@whosawhatsis, thank you very much for helping @justmyopinion with this. We should really really find a way to warn user about such problems in input models...

[whosawhatsis]

@alexrj Just thinking out loud, with a fully 3d-plater like the one that Cura has, you could highlight areas that are too thin to print. You could also highlight overhangs the way Cura does. This would be the most user-friendly way, though it wouldn't help people who aren't using Slic3r's GUI to slice.