STL Part Separator

Auto-detect & export parts · STL · STEP · OBJ · 3MF · glTF · FBX & more
🖼 Image Layers
Drop or paste (Ctrl+V) an image to add a layer
🔓 = drag to move · corner handle / wheel = scale
⚠ Undercut & draft — injection moulding
1.5°
Green drafted · Amber below the angle · Red trapped, needs a side action.
GLB opens in Windows 3D Viewer / Quick Look — spin it and see the flags.
✒ Vector line art from this view
25
0.35
Load a model first.
Outline + crease lines, joined into continuous paths.
Pick a standard view (keys 1-6) for a straight-on elevation.
🧊 Make Solid — fill & fuse
160
1
0
Load a model first.
Voxel fill of all visible parts → one manifold solid.
Higher Detail = finer surface (slower). Hide parts to exclude them.
⇄ Mirror parts
Load a model first.
A mirror reverses the triangle winding as well as the geometry, so the exported STL stays a proper outward-facing solid — not an inside-out shell. Tick parts in the list to mirror only those; otherwise every visible part is mirrored. ⌘Z / Ctrl+Z undoes it.
🧩

Upload one or more STL files to begin

Multiple files load into the same scene

Drop 3D file(s) or image(s) here · multiple OK
Processing STL…
Parsing triangles
🖱 Drag rotate · Scroll zoom · Right-click pan · Click a part to hide · Shift-click to isolate · Shift-drag = box select · 1-6 = views · O = ortho
✥ MOVE MODE — tick / click / box-select parts ▸ drag X/Y/Z to move them together
0 selected Esc to exit
⌖ ALIGN MODE — click a flat face on the part to move, then click the matching face on another part
View
Edit model
Display
Analyse
Export view
Parts 0