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When a print's own 3MF cannot be fetched the usage tracker borrows one from the library or a previous archive, matching on the filename stem. That is far weaker evidence than it looks: Bambu Studio writes the printer-side filename from the project's Title metadata, so every plate of a project reaches the printer under one name however the file was renamed on disk. The reporter's single-filament job was handed a previous archive's three-filament plate. Three spools were debited for material that was never extruded, and nothing on the archive said the numbers were someone else's. A candidate is now rejected when it positively contradicts the print - a different plate, or a filament count the slicer's ams_mapping disagrees with - and the accepted one is logged with both expectations. Only on a contradiction: the plate needs firmware that echoes it and the count needs a print command Bambuddy saw, and refusing everything uncorroborated would retire the fallback recovery this same issue asked for. The count is scoped to one plate or not compared at all. Unscoped, the filament reader collects every <filament> in the file, and that sum against one plate's count would reject every multi-plate library upload on exactly the firmwares that cannot tell us the plate. ----- Give a download the time the file needs, and one printer at a time (issue #2957) ftp_timeout is handed to every download as both the socket inactivity timeout and the whole-transfer deadline, which makes its 30s default a cap on how big a file a printer may serve. The reporter measured one 5.4 MB 3MF at 45s off a worn P1S SD card and 25s off a new one, and a 15.15 MB 3MF at 105s. None of those links were broken - they were slow, which is what the inactivity timeout exists to tell apart. download_to_file already asks for SIZE. It now reports it, and the total deadline follows the file at the 25 KB/s floor _upload_deadline has used since do, so #2572's cap on the executor queue wait is untouched. Capped at 300s for a reason that is not about FTP: on_print_start holds a pooled DB connection across its whole 3MF hunt. Downloads also take turns per printer now. He watched Bambu Studio lose its own connection while Bambuddy pulled a 12 MB 3MF, and a later log caught two Bambuddy downloads of the same file overlapping at print start. The gate is soft - whoever cannot have it within 30s goes anyway, because a print losing its 3MF to queueing is worse than the contention, and a soft gate cannot deadlock. It is also meaningful for the first time. The 90s cap on a multi-path lookup returned while its worker kept walking the remaining paths, still on the printer's socket; that walk is now cancelled and waited out before the printer is handed on. ----- Look in the shared 3MF cache again before each cover retry (issue #2957) The cover endpoint and the print-start archive flow share a cache so whichever fetches the 3MF first hands it to the other (#972). The cover consulted it once on the way in, then retried for up to two and a half minutes without looking again. In the reporter's log the archive flow published the file 42 seconds into that sequence and the cover's third attempt still pulled its own 5,250,969-byte copy, off a printer that was mid-print on the same SD card. A file picked up that way is left alone rather than re-registered under this endpoint's own name or deleted on the way out. It is the archive flow's.