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The Slice and Open in Slicer actions mint a short-lived token and put it in the URL, because a protocol handler cannot carry an Authorization header. That token was spent by the first request to reach the endpoint, which made the handoff depend on the slicer fetching the URL exactly once. Nothing guarantees that: Bambu Studio's downloader retries three times after a failed attempt, transfers get resumed, on-access scanners fetch. The first request won and the slicer was handed a 403. verify_slicer_download_token takes a keyword-only single_use flag. The default still consumes via DELETE...RETURNING; single_use=False verifies with a SELECT and leaves the row for the rest of its five-minute TTL. The stored row is the same either way, so the endpoint decides, not the mint. The three protocol-handler downloads pass single_use=False: a library file, an archive's sliced 3MF, an archive's source 3MF. Resource binding and expiry are untouched. The two browser downloads keep consuming, because what they hand over is itself consumed -- the prepared printer bundle is deleted the moment it has been streamed. Also: add "/source-dl/" to PUBLIC_API_PATTERNS. Those patterns match by substring and the source 3MF route's segment is source-dl, which does not contain "/dl/", so with auth enabled the middleware rejected the slicer's header-less request before the route's token check ran. Open source 3MF in slicer could never work on an install with authentication on.