Flow Hive top plug

These pieces are easy to lose since they are molded from clear plastic so you need spares.
I modified the great design by zukibeast to not need any support. This was done by putting a flange panel and chamfers under the curved handle and by changing the shape of the tit on the back side to have a 45 degree bottom.

I decided to print mine out of TPU on an Ultimaker. I chose TPU to make them like a rubber plug.