[GH-ISSUE #292 ] [Feature]: AMS drying support #180

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@maziggy commented on GitHub (Feb 8, 2026):

⚠ Minimum supported firmware version: 01.02.30.00 Beta（H2D）. Support for other models is under development.

@maziggy commented on GitHub (Feb 8, 2026): ⚠ Minimum supported firmware version: 01.02.30.00 Beta（H2D）. Support for other models is under development.

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 4, 2026):

The filament can't be loaded for the AMS to rotate the spool during drying, so I think at minimum if Bambuddy had the option to restart drying after each print for the specific material that is loaded... that would be a huge new feature!

@cadtoolbox commented on GitHub (Mar 4, 2026): The filament can't be loaded for the AMS to rotate the spool during drying, so I think at minimum if Bambuddy had the option to restart drying after each print for the specific material that is loaded... that would be a huge new feature!

BreizhHardware commented

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@maziggy commented on GitHub (Mar 5, 2026):

Waitng for new firmware version.

@maziggy commented on GitHub (Mar 5, 2026): Waitng for new firmware version.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 12, 2026):

Just upgraded my H2D and looking into drying support now.

@maziggy commented on GitHub (Mar 12, 2026): Just upgraded my H2D and looking into drying support now.

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 12, 2026):

@maziggy I had some discussions about how this would work. Ideally, idle printer time should allow bambuddy to enable AMS drying. I think it needs to be humidity based though so it's not running excessively. Once the set-point is met, it should disable drying. We only using AMS drying with loaded filament.

@cadtoolbox commented on GitHub (Mar 12, 2026): @maziggy I had some discussions about how this would work. Ideally, idle printer time should allow bambuddy to enable AMS drying. I think it needs to be humidity based though so it's not running excessively. Once the set-point is met, it should disable drying. We only using AMS drying with loaded filament.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 12, 2026):

Ahh I see, so it should be configured globally for the queue. I thought about a "drying item", that can be added to the queue between prints.

@maziggy commented on GitHub (Mar 12, 2026): Ahh I see, so it should be configured globally for the queue. I thought about a "drying item", that can be added to the queue between prints.

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 12, 2026):

Ideally, it should be set per AMS as an option to control (depends on what filament is loaded) and by humidity.

@cadtoolbox commented on GitHub (Mar 12, 2026): Ideally, it should be set per AMS as an option to control (depends on what filament is loaded) and by humidity.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 12, 2026):

Yes, but what is prefered? The per AMS global queue setting, or an AMS dry item that can be added to the queue?

@maziggy commented on GitHub (Mar 12, 2026): Yes, but what is prefered? The per AMS global queue setting, or an AMS dry item that can be added to the queue?

BreizhHardware commented

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@maziggy commented on GitHub (Mar 12, 2026):

@maziggy commented on GitHub (Mar 12, 2026): <img width="285" height="317" alt="Image" src="https://github.com/user-attachments/assets/35448e84-7b29-4be7-823c-be896eb0a85e" /> <img width="294" height="158" alt="Image" src="https://github.com/user-attachments/assets/66dc54e1-0245-4c1d-a7e9-735f902bf981" />

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 12, 2026):

I think "Start Drying" should be more automatic that it turns it on and off on a global basis. Adding a drying item to the queue seems odd to me.

@cadtoolbox commented on GitHub (Mar 12, 2026): I think "Start Drying" should be more automatic that it turns it on and off on a global basis. Adding a drying item to the queue seems odd to me.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 13, 2026):

I need some more infos please.

Here's the current design idea — we'd love your input on one key question.

How it works:

Configure drying presets per filament type in Settings → Filament (temp + duration for AMS 2 Pro / AMS-HT)
Enable/disable auto-drying via a toggle on the Queue page
When enabled, Bambuddy checks AMS humidity after each print completes. If humidity is above your configured threshold, it starts drying automatically
For mixed filament types in one AMS unit (e.g., PLA + PETG), the most conservative settings are used (lowest temp, longest duration) to protect sensitive materials
Each AMS unit is evaluated independently based on its own humidity sensor

The question: should drying block the queue or not?

Option A — Drying blocks the queue: After a print finishes, drying starts and the next print waits until drying is complete. Guarantees dry filament for every print, but a 12h drying cycle would delay the entire queue.

Option B — Print takes priority: Drying starts when the printer goes idle, but if the next queued print is ready, drying is stopped (or skipped) and the print starts immediately. Drying only happens in natural gaps (e.g., nothing else in queue, or long delay before next scheduled print). Filament gets dried when possible, but prints are never delayed.

Which do you prefer? Or would you want this to be a user-configurable option (e.g., a "wait for drying" checkbox)?

@maziggy commented on GitHub (Mar 13, 2026): I need some more infos please. Here's the current design idea — we'd love your input on one key question. How it works: - Configure drying presets per filament type in Settings → Filament (temp + duration for AMS 2 Pro / AMS-HT) - Enable/disable auto-drying via a toggle on the Queue page - When enabled, Bambuddy checks AMS humidity after each print completes. If humidity is above your configured threshold, it starts drying automatically - For mixed filament types in one AMS unit (e.g., PLA + PETG), the most conservative settings are used (lowest temp, longest duration) to protect sensitive materials - Each AMS unit is evaluated independently based on its own humidity sensor The question: should drying block the queue or not? Option A — Drying blocks the queue: After a print finishes, drying starts and the next print waits until drying is complete. Guarantees dry filament for every print, but a 12h drying cycle would delay the entire queue. Option B — Print takes priority: Drying starts when the printer goes idle, but if the next queued print is ready, drying is stopped (or skipped) and the print starts immediately. Drying only happens in natural gaps (e.g., nothing else in queue, or long delay before next scheduled print). Filament gets dried when possible, but prints are never delayed. Which do you prefer? Or would you want this to be a user-configurable option (e.g., a "wait for drying" checkbox)?

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 13, 2026):

My opinion:

Option B: Printing takes priority normally, but we may want to consider a toggle for one-time use on a specific AMS to "delay prints until dry". This would be used for specific use-cases where drying is required and not as a preventative measure.

We should also have a check if the AMS aux power is connected. This changes the behavior of how many AMS's can dry at once if just using the printer power. We should probably have drying disabled all-together for AMS's without Aux power.

@cadtoolbox commented on GitHub (Mar 13, 2026): My opinion: Option B: Printing takes priority normally, but we may want to consider a toggle for one-time use on a specific AMS to "delay prints until dry". This would be used for specific use-cases where drying is required and not as a preventative measure. We should also have a check if the AMS aux power is connected. This changes the behavior of how many AMS's can dry at once if just using the printer power. We should probably have drying disabled all-together for AMS's without Aux power.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 14, 2026):

07XX_9200_0002_0003 │ AMS heater 1 fan can't start — power adapter not connected
07XX_9300_0002_0003 │ AMS heater 2 fan can't start — power adapter not connected
07XX_9800_0002_0001 │ Power adapter voltage too low
07XX_9800_0002_0002 │ Power adapter voltage too high
18XX_2500_0002_0001 │ AMS-HT uses printer power for drying — connect adapter
18XX_92/93... │ Same fan errors for AMS-HT
18XX_98... │ Same voltage errors for AMS-HT

@maziggy commented on GitHub (Mar 14, 2026): 07XX_9200_0002_0003 │ AMS heater 1 fan can't start — power adapter not connected 07XX_9300_0002_0003 │ AMS heater 2 fan can't start — power adapter not connected 07XX_9800_0002_0001 │ Power adapter voltage too low 07XX_9800_0002_0002 │ Power adapter voltage too high 18XX_2500_0002_0001 │ AMS-HT uses printer power for drying — connect adapter 18XX_92/93... │ Same fan errors for AMS-HT 18XX_98... │ Same voltage errors for AMS-HT

BreizhHardware commented

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@maziggy commented on GitHub (Mar 14, 2026):

@maziggy commented on GitHub (Mar 14, 2026): <img width="611" height="930" alt="Image" src="https://github.com/user-attachments/assets/97b2c11d-aa7e-4e77-a644-a8f6f91b6fc2" /> <img width="614" height="1211" alt="Image" src="https://github.com/user-attachments/assets/439fa551-9dcc-46ea-a611-ef6a8f11df41" />

BreizhHardware commented

Docs:
https://wiki.bambuddy.cool/features/ams/?h=drying#starting-a-drying-session
https://wiki.bambuddy.cool/features/ams/?h=dry#remote-ams-drying

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@maziggy commented on GitHub (Mar 14, 2026):

@cadtoolbox Are you willing to give it a try? We also should check if the AMS PSU warning will trigger.

Please use dev branch.

@maziggy commented on GitHub (Mar 14, 2026): @cadtoolbox Are you willing to give it a try? We also should check if the AMS PSU warning will trigger. Please use dev branch. Docs: https://wiki.bambuddy.cool/features/ams/?h=drying#starting-a-drying-session https://wiki.bambuddy.cool/features/ams/?h=dry#remote-ams-drying

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 14, 2026):

@maziggy I'm not sure about this:
"The scheduler checks idle printers that have scheduled queue items"

Ideally, I think it should auto-dry regardless of if anything is scheduled to print on the printer or not. When you are ready to print, the filament should be ready to go without having to wait. Can this be a toggle to auto-dry only based on humidity and not the queue?

@cadtoolbox commented on GitHub (Mar 14, 2026): @maziggy I'm not sure about this: "The scheduler checks idle printers that have scheduled queue items" Ideally, I think it should auto-dry regardless of if anything is scheduled to print on the printer or not. When you are ready to print, the filament should be ready to go without having to wait. Can this be a toggle to auto-dry only based on humidity and not the queue?

BreizhHardware commented

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@maziggy commented on GitHub (Mar 14, 2026):

Sure....

@maziggy commented on GitHub (Mar 14, 2026): Sure....

BreizhHardware commented

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@maziggy commented on GitHub (Mar 14, 2026):

Voilla.

@maziggy commented on GitHub (Mar 14, 2026): Voilla.

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 14, 2026):

@maziggy This works beautifully!

I'll need to test it more throughout next week, but it seems to be fairly straightforward.

@cadtoolbox commented on GitHub (Mar 14, 2026): @maziggy This works beautifully! I'll need to test it more throughout next week, but it seems to be fairly straightforward.

BreizhHardware commented

bambuddy-support-20260316-075735.zip

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@cadtoolbox commented on GitHub (Mar 16, 2026):

@maziggy Some of the HT's do not seem to start drying when manually turned on from the printer's screen.

@cadtoolbox commented on GitHub (Mar 16, 2026): @maziggy Some of the HT's do not seem to start drying when manually turned on from the printer's screen. [bambuddy-support-20260316-075735.zip](https://github.com/user-attachments/files/26022633/bambuddy-support-20260316-075735.zip)

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

Some of the HT's do not seem to start drying when manually turned on from the printer's screen.

Then it's a firmware bug?!

@maziggy commented on GitHub (Mar 16, 2026): >Some of the HT's do not seem to start drying when manually turned on from the printer's screen. Then it's a firmware bug?!

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

Or do you mean Bambuddy's printer card?

@maziggy commented on GitHub (Mar 16, 2026): Or do you mean Bambuddy's printer card?

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 16, 2026):

@maziggy Sorry, yes. I meant Bambuddy's printers screen.

@cadtoolbox commented on GitHub (Mar 16, 2026): @maziggy Sorry, yes. I meant Bambuddy's printers screen.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

The only thing I see in the logs is:

2026-03-16 07:57:10,344 INFO [backend.app.services.bambu_mqtt] SERIAL Sent drying command: ams_id=131, temp=65, duration=1, mode=1
2026-03-16 07:57:10,356 DEBUG [backend.app.services.bambu_mqtt] SERIAL Ignoring spurious disconnect (last message 0.8s ago)

@maziggy commented on GitHub (Mar 16, 2026): The only thing I see in the logs is: >2026-03-16 07:57:10,344 INFO [backend.app.services.bambu_mqtt] [[SERIAL]] Sent drying command: ams_id=131, temp=65, duration=1, mode=1 >2026-03-16 07:57:10,356 DEBUG [backend.app.services.bambu_mqtt] [[SERIAL]] Ignoring spurious disconnect (last message 0.8s ago)

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

Should look like this

2026-03-16 13:47:59,346 INFO [backend.app.services.bambu_mqtt] SERIAL Sent drying command: ams_id=128, temp=45, duration=12, mode=1
2026-03-16 13:47:59,727 DEBUG [backend.app.services.bambu_mqtt] SERIAL Received command response: ams_filament_drying

@maziggy commented on GitHub (Mar 16, 2026): Should look like this >2026-03-16 13:47:59,346 INFO [backend.app.services.bambu_mqtt] [[SERIAL]] Sent drying command: ams_id=128, temp=45, duration=12, mode=1 >2026-03-16 13:47:59,727 DEBUG [backend.app.services.bambu_mqtt] [[SERIAL]] Received command response: ams_filament_drying

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

Ah wait....you're using 4x AMS-HT.

ams_id=131

Let me check a few things.....

@maziggy commented on GitHub (Mar 16, 2026): Ah wait....you're using 4x AMS-HT. >ams_id=131 Let me check a few things.....

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

No, the code looks correct.

Since we saw a spurious MQTT disconnect at the same time you started drying, please try again.

Just checked with my H2D with HT-AMS and it works as expected.

@maziggy commented on GitHub (Mar 16, 2026): No, the code looks correct. Since we saw a spurious MQTT disconnect at the same time you started drying, please try again. Just checked with my H2D with HT-AMS and it works as expected.

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 16, 2026):

2 AMS-2's and 2-HT's per nozzle on the H2D Pro if that helps.

For the HT's: If I keep the drying time at 12hrs, it turns on without issues. If I adjust the drying time to lower hours, it never turns on.

@cadtoolbox commented on GitHub (Mar 16, 2026): 2 AMS-2's and 2-HT's per nozzle on the H2D Pro if that helps. For the HT's: If I keep the drying time at 12hrs, it turns on without issues. If I adjust the drying time to lower hours, it never turns on.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 16, 2026):

Cannot reproduce. Changed drying time from 12 to 6 hours and it started.

Can you please upload more debug logs while trying to start drying?

BTW: Just released 0.2.2 final.

@maziggy commented on GitHub (Mar 16, 2026): Cannot reproduce. Changed drying time from 12 to 6 hours and it started. Can you please upload more debug logs while trying to start drying? BTW: Just released 0.2.2 final.

BreizhHardware commented

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@cadtoolbox commented on GitHub (Mar 16, 2026):

It could be just network lag. I'm at home over VPN with Bambuddy running local on my laptop for testing. Waiting on PR#693 to merge before I can update the local Bambuddy instance connected to our printers.

@cadtoolbox commented on GitHub (Mar 16, 2026): It could be just network lag. I'm at home over VPN with Bambuddy running local on my laptop for testing. Waiting on PR#693 to merge before I can update the local Bambuddy instance connected to our printers.

BreizhHardware commented