The live connection reads tray_now (unit × 4 + slot, 254 external, 255
none) and works out the unit by id or, failing that, by position — so the
A2L's AMS lite numbered 16 is handled. Cards say 'Using' (or 'Loaded' when
not printing) with the filament's name and slot, mark the slot in the list,
and draw a tube in its colour from that spool to the toolhead, with a
moving flow while printing. The external spool is drawn when it's in use.
Debug reports include tray_now and tray_tar.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
1aca9a6c01