shower drain extractor

Hello,
I have a drain in the shower very difficult to remove by hand (I hurt my fingers several times wanting to remove it).
So I propose a drain extractor to help you.
You can see that the yellow part is repaired, it is because I printed it in a bad position. I correct the STL position in file that I uploaded.

https://www.youtube.com/watch?v=zix0taJY7yQ&index=3&list=UUzjQ0_Glvzuqm2QkXoZKMqw