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maziggy 2e405afcd1 Decide whether a 3MF is sliced by looking inside it (issue #2993)
An archive that showed the green GCODE badge could re-import into the
File Manager as a source-only project with no Print button, seemingly at
random.

Nothing was ever lost from the file. The download serves the stored
bytes verbatim and the G-code was still in the zip; the two sides simply
asked different questions. Archives looked inside the file. The library
looked at the filename. So a sliced 3MF stored as Foo.3mf rather than
Foo.gcode.3mf earned the badge and lost the Print button, and which one
you got depended on how the print had reached the printer -- a slicer's
LAN send names it .gcode.3mf, a per-plate export or a cloud-dispatched
print does not.

Both sides now ask one shared predicate about the zip itself, and every
route into the library classifies on content. Only the central directory
is read, and only when the name has not already settled it, so ingest
costs nothing extra -- the external scan opens each 3MF for its
thumbnail regardless. Rows already stored are re-checked once, internal
ones only: an external row points at a mount that may be slow or absent,
and startup is the worst place to discover that.

The Slice action moves with it. Its refusal to slice an output was as
name-bound as the Print gate, and without that a file that correctly
gained a Print button would have offered to re-slice its own G-code.
2026-08-29 14:14:26 +02:00

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