Thumbnail generation for 3D objects

[ghost]

Opening a new issue, as requested in #2784

Closing due to v2 rewrite. If you encounter this issue in v2, please open a new issue.

Thumbnails for .stl and .3mf would be great, as 3D printing is becoming more and more popular.
This is not present in v2.0.0-alpha.2.

[ghost]

(I followed the "Create new issue" flow, which somehow leads to the creation of a discussion instead)

[faithmckinely-alt]

Thanks for opening this! Adding thumbnails for .stl and .3mf makes sense given the growing interest in 3D printing. Just to clarify—should we track this as a feature request for v2, or is it intended for a future update beyond the current alpha?

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