Missing Geometry in Final Print

[sensebellum 2]

I am having some trouble getting CURA to recognize certain holes in my model.

The hole is present in Sketchup, also in CURA's "Normal" and "X-Ray" view. But when I look at the actually layers it omits this hole completely - and in actuality as I found out at the end of a print. I tried a few different customizations and also the stock options and the paths were rendered just the same. It also ignores them regardless if the file is a .dae or .stl

How can I rectify this?

Also, is there a guide for formatting the models correctly for CURA? I would be interested in learning some of the tricks.

 

[gr5 2,271]

Try unchecking all the "fix horrible" checkboxes. "type A" is probably checked and is probably filling your hole.

They are in the expert menu.

The problem probably relates to "surface normals" which tell cura which side of a polygon faces air and which side faces interior.

 

[gr5 2,271]

The main thing for a good STL is the xray check. If you see no red then the model is pretty good and unchecking all the fix horribles should give you a good result.

Also try not to let polygons be smaller than .1mm.

Cura slices the polygons into a layer and gets a set of lines in no particular order (stl doesn't say which polygons are connected) so then cura strings the lines up into loops. Sometimes two unrelated loops have a point too close together. I've seen this a lot. Cura picks the wrong point and it comes out all wrong. This only happens when you have lots of details much too small to print.