Find out what is an STL file and how you can open and view an STL file with .stl extension in Windows 10. It is native to the stereolithography CAD software.

The same part imported from STL, however, is one single mesh. Of course, in this case, it doesn’t matter much because he has the original file, the STEP, and the STL.

The most common reason an STL file may be not quite right is a mechanical connection where some piece isn’t quite as the designer expected, so the 3D model that interfaces with it no longer fits.