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Drying

The AMS 2 Pro and the AMS HT have built-in heaters. With a BridgeBox, you start and stop drying from Klipper and watch the temperature and humidity from your printer's web interface.

Unit Heater Ceiling
AMS 1 No -
AMS 2 Pro Yes 65 °C
AMS HT Yes 85 °C
AMS Lite No -

Units without a heater still report their temperature and humidity where the hardware has the sensors.

The dryer panel

templates/AFC_Dryer.cfg adds a web panel for every filament dryer on the printer. It finds every heated unit by itself, AMS 2 Pro, AMS HT and ACE alike, each capped at its own ceiling.

  1. Copy templates/AFC_Dryer.cfg into your AFC config folder and restart.
  2. In Mainsail or Fluidd, add it as a webcam: Settings → Webcams → Add, service iframe, URL http://<printer address>:8093/.

The same address works on its own in any browser or on a phone. AFC_DRYER_STATUS prints where the panel is served and which units it found.

From the console

AFC_BAMBU_HEATER_START UNIT=Bambu_AMS_HT_1 TEMP=65 TIME=480

TEMP is in °C and is capped at the unit's ceiling. TIME is in minutes. Add ROTATE=1 to turn the spools while drying, on units that support it.

AFC_BAMBU_HEATER_STOP UNIT=Bambu_AMS_HT_1

Rotating spools

A spool can only turn freely while drying if its filament is unloaded from the feeder.

Lowering the ceiling

dry_max_temp in the chain section caps every heated unit at the lower of that value and the model's own ceiling. Set it in a model or bay section to cap only those units:

[AFC_BridgeBox chain1]
dry_max_temp: 60

A higher value never raises a unit above its model's ceiling.

Power for drying

Warning

One AMS 2 Pro can dry on the BridgeBox's own supply. A second unit heating off the same wire would pull the supply down and reset every unit on the bus, so AFC refuses to start it while the first one is drying on bridge power, and says why. Plug an adapter into either unit, even mid-cycle, and the block lifts. An AMS HT always needs its own mains cord to heat.

AMS firmware and drying

Some AMS firmware versions limit what can happen while drying:

  • An AMS 2 Pro only loads a tray while its dryer is running once it has Bambu's updated AMS firmware. Before that, a load made while drying stalls and fails.
  • An AMS HT on older firmware refuses to start drying with a lane loaded, which AFC reports as a refused dry.

Both are fixed by updating the AMS firmware; see Firmware Updates.

Next step: AMS Lite