What is the STEP format?

STEP (Standard for the Exchange of Product Data, .stp) is a CAD format. Contains a mathematical description of the model (not triangles), it can be edited in CAD (Fusion 360, SolidWorks).

STEP vs. STL

STL = triangle mesh, can't be edited. STEP = parametric model, you can change dimensions, add holes, modify.

For 3D printing

You can't print STEP directly - must export to STL/3MF in CAD first.

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