![]() To reduce the overall number of triangles in your model, open the model in MeshLab and from the Filters menu select “Remeshing, Simplification, and Reconstruction” and then “Simplification: Quadric Edge Collapse Decimation.” For more detailed information, see the Shapeways Tutorial Polygon Reduction with MeshLab as well as Mister P.’s video Mesh Processing: Decimation. Shapeways can accept 3D models with up to one million triangles, but it’s surprisingly easy to go over that threshold, especially if you’re working with 3D scans or a sculpting program. Let us know in the comments if you have other mesh-repair techniques to share! Reducing Triangle Count MeshLab has a dizzying array of menu items with long names, but if you know just which ones to choose then you can repair these three types of issues very quickly. We’ll focus on the top three issues that can arise with meshes: having too many triangles (too fine a mesh), having triangles that are oriented incorrectly or inconsistently, and having triangles that intersect with bad geometry. Sometimes there are problems with that mesh that cause printability issues, and MeshLab can help you fix most of those issues to make your files ready for printing. When you export a 3D file to STL format, what you’re doing is creating a file that describes the surface of an object with a mesh of tiny triangles. If you don't see any actual holes (coloured pink/green polka) when the message pops up, I don't think you need to be concerned.Welcome to Tutorial Tuesday! This week we’ll discuss three methods for modifying 3D meshes with the free software MeshLab. ![]() However Cura automatically closes all holes less than 5 micron wide when slicing, and I've seen before that the detection of non-manifold meshes is more sensitive than that. The symptom of non-manifold meshes is that chunks of some layers are missing, so it's really easy to see. Some people say it's not a problem in Cura 4.6 (but some people deny that too) so downgrading might help.Īlso, are you saying I should just ignore the "not manifold" message? The model looks fine and there aren't any polka dots so I would assume its fine.Īlways check layer view first, see if anything is missing. The issue seems to trigger by opening certain dialogues or switching context, and restarting Cura also seems to help until you open such a dialogue again. There is one workaround posted by Lukapp here. ![]() ![]() You learn to recognise issues people have ) It's just that for work, the past 6 years, I spent ~3 hours per day triaging issues and this is a common one recently. So just be sure to check out Layer View before you print. But if the model is very complex you might see that some pieces are missing from the print. Quite often it guesses well if there are just small holes. Although humans can usually gloss over small holes and guess where the inside is, a computer sees those as a problem.Ĭura will then just guess what the inside is. If there are holes in the surface or extra walls in the middle, it's ambiguous where exactly the inside of a model is. Why is this a problem for 3D printing? Because to make it physical, Cura will need to know what the inside volume is of your model. In particular SketchUp is notorious for making non-manifold meshes.Įven on Thingiverse there are a lot of 3D models that have been taken from some game or just made with bad software and those are not ideal for 3D printing.
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