STEP/STP → STL: send engineering models to your slicer.
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Turn CAD solids (.step, .stp, or compressed .stpz, .stepz, .zstep) into triangular mesh STL. Curved surfaces are tessellated automatically, and you can set the up axis, rotate the part or split an assembly into separate STL files. STEP tessellation happens locally in your browser, so your files are never uploaded.
| Option | What it does | Default / range |
|---|---|---|
Up axis | Determines the 'up' axis of the exported model. Different 3D software uses different conventions. Selecting the wrong system may cause the model to lie on its side.
| Z-up |
Rotation X | Rotate the model around the X axis (degrees). Useful for correcting axis misalignment or print orientation. | 0°-180° – 180° |
Rotation Y | Rotate the model around the Y axis (degrees). Useful for correcting axis misalignment or print orientation. | 0°-180° – 180° |
Rotation Z | Rotate the model around the Z axis (degrees). Useful for correcting axis misalignment or print orientation. | 0°-180° – 180° |
Rotation Application | Choose how rotation is written to the exported model. Baking into vertices rewrites all vertex coordinates so every export format (including geometry-only formats such as STL and STEP) applies it consistently; root node transform keeps the original vertex coordinates, which is friendlier to animated or skinned models, but formats that ignore node transforms (such as STEP) won't apply the rotation.
| Root node transform |
| Option | What it does | Default / range |
|---|---|---|
Binary Format | Choose the STL storage format. Both formats produce identical print results.
| Binary STL |
Split Multiple Parts | Export independent meshes as separate STL files packaged in a ZIP archive. | off |
STL is a mesh of triangles, so a few things change when you convert STEP to STL.
| Problem | Likely cause | What to do |
|---|---|---|
| The model has the wrong size | STL has no units; slicers assume millimetres | Scale the model in your slicer, or set units in your CAD program before exporting STEP. |
| All parts come out as one object | Assemblies are combined into one mesh by default | Turn on Split Multiple Parts in the STL settings to get one STL per part in a ZIP. |
No. STL only contains triangular faces, so annotations, dimensions, and other engineering data are lost. STL is a pure geometry format for printing and viewing. When you need documentation, rely on the original STEP file.
Complex STEP geometry is tessellated locally in your browser, so conversion time grows with the number of surfaces, and large assemblies take the longest.
Threads and small holes are tessellated automatically along with the rest of the part. Check the preview before downloading; very fine threads can look slightly faceted compared with the CAD model.
All common slicers, including Cura, PrusaSlicer, Bambu Studio and OrcaSlicer, open STL files.
No. STL stores only the shape. If you need colors, export 3MF or GLB instead.
STL to STEP gives a solid made of small flat faces, not the original smooth surfaces, so keep your original STEP file for later edits.
