What is this part? Dropped from A1C box

I found this rubber component in the Bambu Lab A1 Combo box. What is this?
I tried to find where this part belongs to, but could not find anywhere missing a thing like this. Can anyone help? Thanks a lot!




Looks like one of the plugs from the stock external spool mount.

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Thanks! It is! I did not use this but AMS Lite so did not check that.

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