Unable to fit. Cup into base of rocket blender
I had this exact same problem and was scratching my head why would that happen all of a sudden. After taking it completely apart (which I didn't need to), I realized in the end that the cup rim was stuck at the bottom of the blender base. It looked like a part of the base what got me confused the first place. The base of the blender is flat with no ridges around; check if this is the same problem with yours.
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