I have two gray filaments in my AMS units. They are slightly different in color in real life but Bambu Studio was showing them having the same color. One might be a refill of the same color but the colors were definitely different in real life. I selected the second filament for my print but Bambu Studio seems to want to use the first filament when printing because it was assuming it was the same filament. The first filament was mapped to the [2] key and the second filament was mapped to the [6] key. I had selected the second filament (key ā6ā) but it printed using the first filament that was mapped to the ā2ā key.
You can pick any slot with the same type of filament when sending the job, it will work around it for now at least:
So, in your case it should show its about to print with A2, the first match, but you want B2 I think is what it will map to.
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I may have not explained the problem well. The filament in slot ā2ā is a blue-gray and the filament in slot ā6ā is a light-gray even though Bambu Studio shows them as both the same color filament. I colored the model with the ā6ā filament but it my model was printed using the blue-gray ā2ā filament. Iām guessing the reason it did that is because Bambu Studio thinks both are the same color gray. Iām just reporting a bug and not looking for a work-around for the issue.