Discussion
Which one of the following options is NOT an error associated with STereoLithography (STL) file in additive manufacturing?
Answer: A
The one that is not an STL file error is the staircase effect.
The staircase effect is a build error: slicing a part into layers of finite thickness leaves stepped surfaces on slopes and curves. It arises in fabrication whatever the quality of the STL file.
Missing facets (gaps in the triangle mesh), non-manifold topology (edges shared by more than two triangles, for example) and degenerate facets (triangles with collinear vertices or zero area) are all defects of the STL tessellation itself.
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