domain: onshape.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Authenticate using Onshape API keys (access key/secret) with the HMAC signing scheme documented in the Onshape developer portal.
For direct part-level STL export, call GET /api/v6/parts/d/{did}/w/{wid}/e/{eid}/partid/{partId}/STL with query params for mode, grouping, scale, and units.
For STEP (or other CAD-interop formats), POST to the relevant translations endpoint (part studio or assembly) specifying formatName: "STEP" in the request body.
Poll the returned translation request (e.g. GET /api/v8/translations/{translationId}) until requestState transitions from ACTIVE to DONE or FAILED.
On DONE, use the resultExternalDataIds from the response to download the translated file via the corresponding blob-download endpoint.
Known gotchas
STL can be fetched synchronously from a dedicated endpoint, but STEP/IGES and other CAD-interop formats go through an asynchronous translation job that must be polled — treating it as synchronous yields empty or incomplete downloads.
Export behavior differs between exporting an individual Part, a Part Studio, and an Assembly — the same target format can require a different endpoint depending on which of these you're exporting.
Not all format combinations are symmetric (e.g. some report STEP export working where DXF or OBJ export from the same element fails) — verify the specific document/format pairing before relying on it.
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