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Reporter exported a multi-plate .gcode.3mf from Bambu Studio to the
shared folder Bambuddy watches and the 3D preview tab came up empty;
if he re-uploaded the same file via the file manager, the preview
worked. Root cause: two paths classify file_type differently. The
shared-folder scan at backend/app/api/routes/library.py:1343-1348
does a compound-extension check and tags the file `gcode.3mf`; the
upload path at the same file's :1588 does a single `ext[1:]` and tags
it `3mf`. Then frontend/src/components/ModelViewerModal.tsx:71-73 had
hasModel = normalizedType === '3mf' || 'stl'
hasGcode = normalizedType === 'gcode' || '3mf'
Neither matched `gcode.3mf`, so the capabilities object landed with
both flags false and the modal rendered an empty bed.
FileManagerPage.tsx:858 also gated the Preview-3D context action on
`file_type === '3mf' || 'gcode' || 'stl'`, so for shared-folder files
the menu entry didn't even appear, and the type pill at :765-770 had
no colour case for `gcode.3mf` so it fell through to the generic
gray.
Fix (frontend-only, no backend churn):
- ModelViewerModal.tsx introduces an
`isThreeMfFamily = normalizedType === '3mf' || normalizedType === 'gcode.3mf'`
predicate used in two branches — the capabilities check
(`hasModel = isThreeMfFamily || 'stl'`, `hasGcode = isThreeMfFamily
|| 'gcode'`) and the plates-loading branch that previously hard-
gated on `!== '3mf'` and would have returned setPlatesData(null)
for the shared-folder file.
- FileManagerPage.tsx adds `gcode.3mf` to the Preview-3D action gate
and shares the gcode blue type-pill colour so sliced-output files
are visually distinguishable from source 3MFs.
The compound `gcode.3mf` classification on the backend is intentionally
preserved — it carries useful "this is a sliced output" semantics that
other UI surfaces could use later. The `canOpenInSlicer` and
`sliceableType` checks at ModelViewerModal.tsx:269, 277-280 are
deliberately left alone — a sliced output isn't openable in the slicer,
and `sliceableType` already explicitly excludes `.gcode` and
`.gcode.3mf` per the comment.
Out of scope (separate Bambu-Studio format limitation, not a Bambuddy
bug): Vlado's secondary observation that the upload-path 3D preview
"shows only one plate" even though his project has 5 plates — Bambu
Studio's .gcode.3mf export contains the model data and g-code for the
active plate only, not the entire multi-plate project. The print
picker enumerates plates via gcode_*.gcode entries inside the zip
(a separate code path), which is why the user can still pick the
plate at print time. The empty-bed fix is the data point that closes
the user-visible bug.
