3D Slicer
Drop an STL, 3MF, OBJ or glTF model, slice it into cross-sections at any layer height along any axis, or project it into a hidden-line drawing. Multi-part 3MF files keep their colours and can be sliced part by part. Export layers or the drawing as SVG, DXF or CSV.
Samples:
Drop an STL, 3MF, OBJ or glTF/GLB model here, or click to choose
Viewer
Drag to orbit · scroll to zoom · right-drag to pan
Layers
- Contours
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- Layer area
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- Perimeter
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- Volume (Σ layers)
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Export
Notes
- Slice cuts the model with a plane at the middle of every layer and joins the cuts into closed contours. Holes are wound the opposite way, so the area and volume figures subtract them. Export all layers as a tiled SVG for a laser-cut stack, or as a DXF with one named layer per slice.
- Drawing makes a hidden-line projection: silhouette edges, creases sharper than the angle you set, and open edges, with the parts hidden behind the model trimmed away. “Camera” projects exactly what the viewer shows; the named views assume the up axis you picked.
- Binary and ASCII STL, 3MF, OBJ and uncompressed glTF/GLB are read. A 3MF with several build items shows a Parts list with its material colours; hide parts to slice or draw the rest on their own. 3MF units are converted to millimetres; STL is taken as millimetres; OBJ is guessed (metres when the model is under a couple of units across, otherwise millimetres) and glTF is metres. Use the File units control at the top if a model comes in the wrong size. Everything runs in your browser; the file is never uploaded. Very large meshes (millions of triangles) will take a while in Drawing mode.