On a dual-nozzle H2C with a Filament Track Switch, a queued print targeting
one nozzle fed a same-type wrong-colour spool: the backend mapping
(_match_filaments_to_slots) hard-filtered candidate trays to the requested
extruder, excluding the correct spool loaded in the other nozzle's AMS — which
the FTS can route across. Confirmed from the reporter's captures: same model
mapped to AMS-A slot 2 (black) on the left nozzle but AMS-B slot 3 (red) on the
right. The #1162 FTS-skip existed only in the frontend mapping, never the
queue-dispatch path.
Read fila_switch.installed in _compute_ams_mapping_for_printer and skip the
per-nozzle filter when an FTS is present. Single-nozzle printers are unaffected
(no nozzle_id in the 3MF, no FTS). Regression tests in TestFtsNozzleBypass.
extract_nozzle_mapping_from_3mf has a single-active-extruder shortcut
(added in #851 for #827) at threemf_tools.py:354 that runs before the
per-filament group_id mapping. It fires whenever
extruder_nozzle_stats reports exactly one extruder as active. On
multi-nozzle Bambu printers (H2D / H2D Pro / X2D / H2C) the slicer
under-reports the second extruder when its nozzle volume-type isn't
enumerated in the slice's profile (common with HT-AMS / High-Flow
asymmetric setups, e.g. HT-AMS feeding the right nozzle on an H2D):
['Standard#1', 'Standard#0'] even when both extruders are genuinely
used. sum(active_extruders) == 1 → every filament was force-assigned
to physical_extruder_map[active_idx], the authoritative group_id was
discarded, and the Filament Mapping panel showed both filaments
badged L with the auto-match hard filter blocking the wrong-nozzle
tray as "Type not found".
Bug is parser-side and model-agnostic, not gated on AMS hardware —
typical dual-AMS H2D slices contain ['Standard#1', 'Standard#1']
(sum==2), never enter the shortcut, and work fine. Physical extrude
routing was not affected (gcode + project_file nozzle_mapping path
from #1780 is authoritative). User-visible harm: wrong L/R badge and
no auto-match for the second nozzle.
Gate the shortcut on len(distinct_group_ids) <= 1 from
slice_info.config. The slice_info parse is hoisted above the shortcut
and reused by Priority 1, so the gate adds zero extra I/O. The gate
only narrows the shortcut — it can't widen the bug onto any
previously-working slice. Generalizes to H2C and any N-nozzle printer
for free (no per-printer branching).
Reporter has a P1S with an inventory spool cloned to slot 1 and the
original (much further used) in slot 4, the preference enabled, and
the dispatch picked slot 1 every time. The sort's been blind to
Bambuddy inventory weights — it reads MQTT `tray.remain`, the
printer firmware's RFID-decremented value, which has two limitations:
- Bambu RFID only. Non-RFID spools report -1 and get clamped to a
sentinel; multiple non-RFID trays then tie in the sort and Python's
stable sort collapses to AMS-slot insertion order, so slot 1 wins.
- Even when set, it's the printer's counter, not Bambuddy's
`label_weight - weight_used` (internal) or Spoolman's
`remaining_weight`. The two diverge whenever the user re-spools,
swaps cardboard, or runs a print outside Bambuddy.
The reporter is on internal-inventory mode with non-RFID spools — both
failure modes apply, hence slot 1 every time.
Fix: when a slot is bound to an inventory spool the inventory record's
remaining weight becomes the sort signal. New async helper
`_build_inventory_remain_overrides(db, printer_id, loaded)` returns
`{global_tray_id: remaining_grams}` for bound slots — internal mode
joins SpoolAssignment → Spool once per dispatch; Spoolman mode joins
SpoolmanSlotAssignment then reuses `_spoolman_remaining_grams` from
filament_deficit.py for parity.
New `_prefer_lowest_sort_key` does a two-tier comparison: inventory-
tracked spools sort BEFORE MQTT-only spools, then ascending by
remaining within each tier, then ascending by ams_id*4+tray_id as the
deterministic slot tie-breaker. The tier flag dominates so grams
(inventory) and percent (MQTT) never get cross-compared — no unit
conversion needed.
MQTT-only behaviour is preserved exactly: remain=-1 still maps to the
101 sentinel and slot order still decides on ties. Users who haven't
bound any inventory spool see no change. The DB lookup runs only when
prefer_lowest_filament is enabled.
External / VT slots are skipped (tracked separately from AMS bindings).
When multiple AMS spools match the same type/color criteria, an optional
setting now prefers the spool with the lowest remaining filament. This
helps consume partial spools before starting new ones. Sorting applies
to all matching paths: queue scheduler, print modal, and multi-printer
mapping. Unknown remain values (-1) sort to end.
Backend:
- Add dual external spool support for H2D (vt_tray as list: Ext-L/Ext-R)
- Add cloud filament ID map endpoint (/cloud/filament-id-map)
- Fix RFID spool data erased by periodic AMS updates (skip tag matcher
for RFID-tagged trays)
- Fix AMS slot config overwrites RFID spool state
- Fix K-profile selection corrupts existing profiles on X1C/P1S
- Resolve K-profiles filament name via cloud filament ID map
- Update print scheduler and usage tracker for dual external spools
Frontend:
- Add printer model filtering to ConfigureAmsSlotModal (cloud/local/builtin
presets filtered by @BBL model suffix and compatible_printers)
- Add pre-population for configured slots (preset, color, K-profile)
- Add K-Profiles view with accurate filament name resolution
- Internationalize all ConfigureAmsSlotModal strings (en/de/fr/it/ja — 21 keys)
- Add 5 new ConfigureAmsSlotModal tests (model filtering, pre-selection,
color pre-population, i18n)
- Update PrintersPage for dual external spool rendering
Docs:
- Update CHANGELOG, README, website features, and wiki AMS docs
Dual-nozzle H2D/H2D Pro: filament matching now respects nozzle assignments
from the 3MF file. Each AMS unit feeds a specific nozzle (L/R), and the
scheduler/frontend constrain matching to only trays on the correct nozzle.
Falls back to unfiltered matching when no trays exist on the target nozzle.
L/R badges shown in the filament mapping UI. Translated in en/de/ja/it.
Fix AMS slot config overwritten on startup: on_ams_change unconditionally
unlinked BL spool assignments on every MQTT pushall, then re-assigned them
sending ams_filament_setting without setting_id — clearing the printer's
filament preset. Now compares spool RFID identifiers before unlinking.
Fix BL spool detection false positives: removed tray_info_idx from detection
logic in both backend is_bambu_lab_spool() and frontend isBambuLabSpool().
Third-party spools using Bambu generic presets had GF-prefixed tray_info_idx
values, causing misidentification. Now uses only tray_uuid and tag_uid.
SQLite WAL mode with 5s busy timeout reduces "database is locked" errors.
AMS-HT global tray ID was calculated as ams_id * 4 (= 512 for unit 128)
but AMS-HT uses the raw ams_id directly since it has a single tray.
The backend misidentified 512 as an external spool, producing wrong
ams_mapping2. Fixed in 4 locations: frontend getGlobalTrayId(), backend
start_print() ams_mapping2 builder, print scheduler, and Spoolman tracking.
The tray_info_idx field is a filament TYPE identifier (e.g., "GFA00" for
generic PLA), not unique per spool. When multiple AMS trays are loaded
with the same filament type, the previous code used find() which always
returned the first match regardless of color.
Now checks if tray_info_idx is unique among available trays:
- If unique: use that tray as definitive match (existing behavior)
- If not unique: fall back to color matching among matching trays
Fixed in both backend (print_scheduler.py) and frontend (useFilamentMapping.ts).
Closes#245
When multiple AMS trays have the same filament type and color, Bambuddy
now uses the tray_info_idx attribute from the 3MF file to identify the
exact spool selected during slicing. This ensures the correct tray is
used rather than just picking the first match.
Matching priority: tray_info_idx > exact color > similar color > type-only
Closes#245
When using "Any [Model]" queue assignment, the scheduler now computes
AMS mapping after a printer is assigned, instead of requiring it upfront.
This fixes H2D Pro (and other printers) failing at filament loading when
queued via model-based assignment. The issue was that no AMS mapping was
sent to the printer because the specific printer wasn't known at queue time.
Closes#192
maziggy