STP File (What It Is and How to Open One) - Lifewire
What to Know. 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. This article describes the various formats that use the STP file extension, including how to open each type and how to convert one to a different format.
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