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Part of what cura does is it intersects a plane with the STL and gets a bunch of line segments in no particular order. For mechanical or architectural models it tends to be that walls or corners are too close to other surfaces or corners. For models that are organic - like sculpture the problem tends to be (somewhat) related to your triangles being too small. It's hard to explain so I'd rather you sent me an STL with issues. 8mm then there are still several other things that can cause this. If the model is manifold (that's a HUGE IF as it is difficult to prove) and if there are no walls that are inside the STL closer together than. stl there are many causes for missing layers. (you could try Meshmixer or Netfabb as well.) The only way I found to fix it was to go back to my modeling app and make a small tweak to the mesh, like moving a couple points around and then exporting again. You know when you rapidly scroll through the layers, Cura will draw layers with gaps in between, and then go back in a fill them in when you stop moving your mouse and it finishing loading the toolpaths? It's like that, except they don't ever get drawn in and appear as slice gaps in the output. The gap doesn't get support added, and they don't get top/bottom surfaces added (it exposes the infill), so Cura doesn't "see" it as a gap in the model. There's nothing that shows up in Xray view and the model is manifold and doesn't have thin walls or anything. Moving or scaling the model, changing the slice thickness, wall thickness, or fix horrible options don't change the gap. There's nothing different about that part of the model (not the start or end of a feature, thin walls, etc.) So far it's happened about 2/3 up and it has been in the form of a thick gap (let's say 1mm) and then a smaller gap slightly above that (say 0.2mm) The second time I caught it before printing.īasically the model slices OK, but there will be a gap of a couple missing layers at a given height. I missed it the first time and printed the goofed up gcode. I've come across this at least twice this week. Really if you had posted a picture it would have helped me not think of problems that might have nothing to do with yours: If this is the problem checking "fix horrible A" might fix it. This can be sometimes fixed by reducing the qty of polygons - there's no reason to have triangles smaller than. So sometimes it gets confused if there are many tiny polygons smaller than. There's a little bit of rounding error in the points so Cura allows a little leeway or slop when deciding if two points are the same. So then Cura goes about hooking up those lines into closed loops. The triangles are in no particular order so the lines are also in no order. The way cura works is it intersects a plane with all the millions of triangles in the STL. You didn't answer the question about if a wall was very thin (under 1mm).Īnother possibility is *too many* short line segments. These are meant to fix "bad" models so if your model isn't bad then you don't want them. Uncheck all of them if your model is perfect.