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An X2D with two AMS 2 Pro, one per hotend, showed a K value on every slot
of the first and nothing on any slot of the second. Configure Slot was
worse than blank there: the picker offered no matching profile, the slot
read as though nothing were bound, and choosing one changed nothing the
user could see. Both symptoms are one rule.
A calibration index can mean two different profiles on a dual-nozzle
machine -- on the maintainer's H2C, index 16 is the left hotend's black
PLA at K=0.018 and 15 is the right's at K=0.020 -- so the index is
resolved against the slot's own hotend, and a miss shows nothing rather
than the other nozzle's number. That is right whenever the printer files
its calibrations per hotend. This one files them per filament: the second
AMS's slots point at the same entries as the first, every entry tagged
with one extruder, and requiring a match found nothing at all.
The hotend now has to appear in the table the printer actually sent
before it is used to narrow anything. Where it does not, the index stands
on its own, which is what BambuStudio does for this same card --
AMSItem.cpp resolves it through get_pa_k_n_value_by_cali_idx, matching
cali_idx and nothing else. Where it does, nothing changes: the H2C case
still blanks rather than borrowing, and the other hotend's profiles stay
reachable under Other K profiles. The relaxed path still refuses an
answer when the candidates disagree on a value.
The premise that the table is always numbered per nozzle had been written
into three comments and two layers of code; it is corrected where it
appears.
Alongside it, in the same picker: the K-profile options rendered the
hotend suffix twice in the matching group and three times under Other, so
every option on a dual-nozzle printer read "... . Left . Left".