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The reporter's AMS-HT would not auto-dry PA6-CF, and drying the same spool by
hand worked. The scheduler reduced a tray to a preset key by splitting on spaces
only, so "PA6-CF" stayed "PA6-CF", matched none of the eight rows the preset
table has, and the tray was read as holding nothing worth drying. The AMS was
then passed over on every scheduler sweep, silently, because every caller reads
"no row" as "nothing to do for this tray".
It was never only nylon. Of the 41 types a printer can report, 33 had no row
under that rule, and 20 of those have a base material sitting right there: every
-CF, -GF and -AERO variant of PLA, PETG, ABS, ASA, PC and PA.
Doing it by hand worked because the drying popover has resolved composites since
exact key first, so a row the user added for the exact type still wins, then the
suffix, then an alias map reading PA6, PA11, PA12, PAHT, PPA and Nylon as PA.
PPA is the one alias that is a judgement rather than a spelling. Polyphthalamide
is a distinct polymer, not a grade of nylon -- but it is an aromatic polyamide,
it takes up moisture the same way, and PA's row is the hottest the table has.
A material with no row and no alias is still skipped rather than dried at a
number nothing here can source. That is where this parts company with the
popover, which falls back to PLA because a dropdown has to show something.
The table is user-editable JSON, so a preset row can be present and empty. That
has always meant "skip this material" and still does: the temp and hours reads
fall back per field to 55C/12h, which would dry a PLA spool at 55 degrees.
Two more callers had the same line and move with it: per-filament humidity
thresholds, where the override set for a material never applied to that
material's composites, and the chamber preheat target, which had the suffix half
of this from #2902 but not the aliases.
The preheat test for that half reimplemented the lookup inline rather than
calling it, so it would have passed whatever the function did. It calls it now.