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3D previews
Check what a file actually is before you slice it. Every model page has an interactive 3D viewer that runs in your browser, so there's nothing to install.
- Formats: STL, 3MF, OBJ and STEP. LightBurn projects get a picture of their design.
- Multi-plate 3MF projects show a thumbnail for every plate, with how many objects each one holds.
- Model colour: pick the colour the preview is shown in.
- Photos sit in their own gallery, separate from the printable files.
Card thumbnails
Model cards in the library show a small 3D thumbnail. A sliced 3MF's own thumbnail is used when it has one. For other files, admins choose under Administration → Rendering how missing thumbnails are made:
- Automatic: rendered in the browser as a card scrolls into view, then saved for everyone.
- On demand: a card shows a Generate preview button instead.
- Disabled: cards show a placeholder. The full viewer still works when the model is opened.
Very detailed models
Models with more than a million triangles can be slow to download and rotate, especially on phones and older computers. With Simplify previews on, under Administration → Rendering, their preview is reduced to about a million triangles, keeping the shape to within 1% of the model's size. Only the preview changes: model files, downloads and anything sent to a slicer are never touched.
The first preview of a very large model can take a minute to prepare, and uses the most memory on the server. If previews fail, check memory in System Health.