Tutor feedback, the mechanism is not that work, I need to make it more clear for audience. the outside shell should have one part to prevent pressing the button by accident.It is better to make the package in one piece not a refill package.
Peer comment: The shape is ergonomic. It is better to make the shape more suitable for Aristic patients.
Next week ,I will modify the shape and make clear mechanism explaination.
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