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An STP file contains 3D image data used by CAD software 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 ...
With this change, one can now drag .stp or .step files directly into PrusaSlicer for printing. First, a brief recap. In the world of 3D models there are two basic kinds: meshes and CAD models.