1. Prepare a model and its source
Sign in, open Workspace, then Projects, and create a Project for the part you are developing. A free account includes one owned project. The browser preview and diff accept STL, OBJ and 3MF.
For a STEP-first workflow, the project owner enables Auto-convert STEP to STL in the project actions menu. Then select a STEP or STP as the main upload: the generated STL and original STEP are saved together. Otherwise, export a preview mesh from your CAD editor and attach its originals separately.
Original attachments can be STEP/STP, SHAPR, FCStd, SCAD, BLEND or ZIP. Attach up to 10 originals per model and include the editor/version and license or reuse terms. The preview, originals and upload package must fit within 100 MiB. Keep them from the same design revision.
2. Invite the people who will work on it
Use the project's sharing and access controls to invite collaborators with an explicit role. A project member can open revisions and download their files; their role determines whether they can upload or review changes. A link to a private project does not grant membership by itself.
In Versions, select a revision and open Original files in the right-hand inspector. Members can download an individual original, a sources ZIP, or Download all files with the preview model. The originals remain attached to that revision, even after a newer one is uploaded.
3. Share originals without project membership
The owner can explicitly create a source link for a revision when its upload includes a license. It lasts seven days. Anyone with the link can download those originals and read the editor/license metadata, but the link does not grant project membership or upload permission.
A new source link replaces the previous one. Revoke disables it; deleting the revision or project also invalidates it. Already downloaded copies cannot be recalled. A normal comparison or review link does not expose editable originals.
Choose the right source and reuse terms
STEP transfers geometry between compatible CAD tools, but does not necessarily preserve the originating editor's feature history. Include the native CAD file too when collaborators need that history. ZIP can hold dependencies for a multi-file design; STL Diff does not execute or extract attached CAD content.
The author supplies the license. STL Diff does not verify it or grant rights on the author's behalf. Missing license information still permits member downloads, but disables external source links. Only share files you have permission to distribute. Collaboration currently uses invitations and explicit links, not a public discovery catalogue.