Slicer software is used to convert your STL file into a G-Code file that can be sent to your 3D printer. There are several slicer software options available, including Cura, Slic3r, and Simplify3D.

The STL (STereoLithography) file format is the standard file format used for 3D printing. It is a mesh-based file that describes the surface geometry of a 3D object. However, when working with CAD ...

An STP file is most likely a STEP 3D CAD file. Open one with Fusion 360 or FreeCAD. Convert to STL, DWG, DXF, etc., with those same programs or a dedicated converter.

However, in real life, you may have an STL file and nothing else. The video shows how you can convert such an object into a proper FreeCAD part. We liked that the example part isn’t a boxy design.