Reversed normals in the sphere on the side of the cylinder have caused inaccurate slicing that creates an unintended void.įixing Problems with STL Files Step 1. In Layers view the cube appears invisible and intersects the cylinder below.Ī second example of a reversed normal in the same model is shown here. but this time it's due to reversed normals in the cube on top of the cylinder. Similar to the manifold error in Example A, this model has been sliced inaccurately. As a result, the middle section of the model is being ignored and will not print at all, appearing invisible in the Layers view.Įxample B) Reversed Normals: Every plane composing each shell of a 3D model has an intended inside and an outside, called a "normal." When a plane’s orientation is reversed in relation to those around it, it’s referred to as a "reversed normal." This becomes an issue when it occurs unintentionally within a model, and ranges from a tiny section of a shell, to intersecting shells of a complex multi-shell model, to an entire model with a single shell that is all reversed.
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While some manifold errors will require you to use modeling software such as Blender to fix the holes, Slic3r’s manifold check and auto-repair tool can be used as an alternate method (outlined in Step 3).Īs you can see in this example, the model has been sliced inaccurately from a manifold error. If there are any holes in the shell, the object is said to be "non-manifold," and this may cause Cura to slice the model inaccurately. If something stands out that that doesn’t look how the model was designed, it’s possible that there are invisible shell errors that are complicating the slicing process.Įxample A) Manifold Error: A 3D model's shell is said to be "manifold" when it can theoretically hold water. As you scroll down through the model, look for inconsistencies. Slide the circles from top to bottom to show only the layers you want to see.
This toggle controls your view of the model, and the default is “Solid.” Select the "Layers” option instead, as this will give you a preview of how each layer will print. Select the drop-down toggle shaped like an eye on the left hand side of the screen. Below are two example models to help illustrate common problems with STL files. Cura will automatically begin slicing the model. Open and Slice STL in Cura LulzBot Editionīring up the problematic STL on Cura LulzBot Edition’s virtual print bed, and then select the material and the desired profile. Identifying Problems with STL Files Step 1.
To alleviate the search, this 3D printing STL file help tutorial shows you a few steps to help identify and correct some problems in your STL file. If you’re not sure what symptoms to look for or what tools to use, identifying these model inconsistencies can seem like searching for a needle in a haystack. Cura automatically compensates for some smaller errors, but larger errors may require alternative methods in order to print correctly. Sometimes a model’s “shells” contain errors that conflict with the intended geometry of the model.
Are you dealing with a print that comes out surprisingly different than what you expected, despite having ruled out more typical problems like improper slicing profile or poor print bed adhesion? It’s possible that your STL file is to blame.
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