The inventory plastic shaft cup on the FT009/016 is NOT a regular cup. It’s plastic and may break if you happen to improve to a bigger prop or a quicker motor.
You can not purchase this shaft cup as a substitute half alone. Due to this fact, you both have to 3d print by yourself ( https://upgradeparts.com/2021/08/13/replacement-shaft-cup-for-ft009/ ), or get a metallic one as an alternative.
Most traditional metallic cups wouldn’t accommodate the comparatively massive shaft pin of the FT009/016 so you will need to do some submitting manually.