This tutorial will teach you how to convert STL graphics to a solid model in SOLIDWORKS. Try it. It worked for me!
Step 1: Open SOLIDWORKS
Start SolidWorks and click Open.

Step 2: Select File Type
Change file type to STL.

Step 3: Click Options
Click Options.

Step 4: Change Import As
Change import as to Solid body.

Step 5: Select STL file
Select STL file and click Open.

Step 6: STL file is updated
And we have STL file converted into Solid Body.











