Mac · Apple silicon and Intel · Mac App Store
STLKit
Prepare STL meshes for 3D printing
STLKit is a native Mac app for getting an STL mesh ready to print. Sculpt and smooth the surface, extrude, pattern or add text, fill holes and seal undercuts, check the mesh and export it. Every edit is previewed before you apply it, and everything runs locally on your Mac.
For Macs with Apple silicon or Intel and macOS 14 or later.
Coming soon to the Mac App Store.
Why STLKit?
Three core arguments
Preview, then apply
Sculpt strokes, extrusions, patterns and text are previewed on the mesh first. Nothing changes until you press Apply, and every edit can be undone and redone.
Made for printing
Check whether a mesh is watertight, find open edges and degenerate triangles, then fill holes, seal undercuts and remove separated parts before you export.
Stays on your Mac
Your meshes are opened and edited locally and never leave the Mac. No account, no tracking, no analytics.
Features
What’s inside
Import and export
Open binary and ASCII STL files. Export STL, OBJ, PLY or 3MF, and record a 360° orbit video of the model as an MP4 file.
Sculpting
Inflate, Smooth, Relax and Soft Deform brushes work locally on the surface. Painted Clay material and a contour-defined support sheet with adjustable sag fill depressions and gaps.
Surface tools
Planarize a region, extrude a surface along its normal, or apply relief patterns such as diamond knurl, honeycomb or ribbed. System-font text follows the clicked surface and is embossed or engraved.
Selections
Select the whole model, a rectangle, a polygon or a brush area, and add to or subtract from the selection.
Topology
Fill holes with a flat or smoothly fitted interior, create holes, seal undercuts around protruding parts, add organic bridges between parts, remove separated parts, and subdivide or reduce polygons.
Print setup
Build a figurine base and check dimensions, volume, watertightness, open edges and degenerate triangles. Automatic repair fixes common problems.
Undo and redo
Every edit is a named step, from global operations to single brush strokes, bridges and fills.
Viewport
Two-finger orbiting, pinch to zoom and several shading styles, with wireframe and polygon overlays. Compare the original with the preview at any time.
18 languages
The app is available in English, German, Czech, Danish, Spanish, Finnish, French, Italian, Japanese, Korean, Norwegian Bokmål, Dutch, Polish, Brazilian Portuguese, Russian, Swedish, Turkish and Simplified Chinese.
Support
Help, bug reports and ideas
For bug reports and feature requests, use the feedback form in the About window of the app, or send an email with the subject “STLKit Feedback”. The app version, your macOS version and a short description of the steps help me most. I read and answer every message myself.
- info@kindler-dev.de
- Phone
- +49 89 62084444
- Developer
- Björn Kindler, Kindler Dev, Bischofshofener Str. 9, 82008 Unterhaching, Germany
System requirements
- Mac with Apple silicon or Intel
- macOS 14 or later
- Input: binary and ASCII STL
- No account and no internet connection needed
FAQ
Short answers
Do my meshes leave the Mac?
No. STLKit works fully offline, has no account and no analytics. It is sandboxed and opens only the files you pick.
Can I undo an edit?
Yes. Every edit has a named undo and redo step. Sculpt previews are applied only when you press Apply.
Which formats can I export?
STL, OBJ, PLY and 3MF, plus a 360° orbit video as an MP4 file. STL files are read as millimetres.
Privacy
Your meshes stay on your Mac.
STLKit collects no data and has no account, no analytics and no tracking. The only data that leaves your Mac is what you send through the optional feedback form in the About window. Full details in the dedicatedSTLKit privacy policy.
Questions? Get in touch