Kept
- The visible shape of every solid
- Assembly placement, baked into the mesh
- The authored millimetre dimensions
Runs locally · no upload
Convert STEP to STL
Tessellate a STEP model into triangles a slicer can read. STEP keeps exact CAD surfaces; STL keeps the faceted approximation, so curved walls and threads deserve a check.
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Drop a 3D file hereSTL, OBJ, PLY, GLB, glTF, 3MF or STEP · up to 100 MB · processed locallyYour file never leaves this browser.
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What changes in the conversion
Dropped
- Exact B-Rep surfaces: they become triangles
- Parametric history, features and constraints
- Materials, colours and PMI annotations
Common mistakes
- A STEP containing only sketches, points or lines has no surface to tessellate.
- Large assemblies can exceed the 60-second browser limit; convert one part at a time.
- Invalid or encrypted STEP files are rejected.
For 3D printing
- Curved surfaces become flat facets; small features can vanish at coarse tessellation.
- Inspect the mesh in your slicer: thin walls and threads are the first casualties.
Drop the file — it is read locally, never uploaded.
Choose the options, then convert or compress.
Download the result and open it in your slicer or 3D software.
Frequently asked questions
Is STEP better than STL?+
For CAD yes: STEP stores exact surfaces and units. For printing, STL is the mesh your slicer expects, produced by tessellating STEP.
Are the dimensions preserved?+
Overall dimensions and placement are preserved; curved surfaces are approximated by triangles, so tolerances depend on tessellation.
Can I convert a whole assembly?+
Yes, but heavy assemblies take longer. For a single print, convert the part you need.
Need a model instead of a conversion?
Turn a photo, a drawing or a logo into a 3D model, then export it in the format you need.