Common questions for AutoCAD

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STL import with STL2CAD builds an invalid 3d solid

Your STL2CAD - Import STL solution creates a true 3d solid object from my STL file successfully but when I try to edit output solid with native AutoCAD commands I get an error message "ACIS solid modeling error". How to fix the invalid solid after the STL import operation?

Our STL2CAD - Import STL application is designed to always create a 3d solid entity from any input STL file. It is the user responsibility to provide a valid STL file (either in binary or ASCII text format) with valid geometry. In general crossing faces, thin walls, open loops and other geometry bugs will always result with wrong geometry for ACIS solid modeling system used in AutoCAD.

Please notice that this problem is also relevant to other our products. For example our Mesh4CAD - Mesh to solid solution can also build for some input 3d objects wrong geometry for ACIS modeling system and all you need to do to avoid this problem during a mesh to solid conversion or 3d file import is to fix your input model.