Free Quick Look previews for 3D and CAD files on macOS.
The built-in macOS preview for 3D files leaves a lot to be desired, so I vibecoded my own lightweight tool and thought I’d share it in case it helps anyone because it's better than expected x)
Might add some other features later.
Press space on an .stl, .obj, .ply, .3mf, .step or .iges file in the Finder. Drag to rotate, pinch to zoom, you can adjust the color and transparency of the wireframe, and the render of your 3D object.
Download the latest release · macOS 13+ · Apple Silicon
Drag into Applications, open once to register the extension, quit, done.
The app is not notarized, so macOS blocks it. Approve under System Settings › Privacy & Security › Open Anyway. Run it from Applications.
How it works · Build · Limitations
MIT. Ships OpenCASCADE under LGPL 2.1 with the OCCT exception (notices).

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