Conversion of stl files to sldprt file format

Solidworks can import STL Stereolithography files (used for 3D printing), so with it you  should also be able to transform / convert it to SolidWorks' SLDPRT format. If you do not have access to Solidworks, you will have to rely on some 3rd party solutions or 3D model / CAD converters.

Open STL file    Open SLDPRT file

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SolidWorks

A 2D and 3D CAD construction software