Ear hole expander
You could buy them in the tatto store but sometimes they try to steal you, on ebay are cheap but If you don't like waiting for 2 weeks this is for you.
Printed in "vase mode" using a 0.5mm nozzle (not the best for the job).
In that mode the piece is printed in a continuous layer so at the end the expander is also a screw.
The base is suppose to be removed but this is up to you.