Based upon a design by TabLeft of an Anet A8 Extruder Button
I made this version from scratch because when I printed his, it didn't fit on the bolt in my Anet A8.
Hopefully mine works for you guys. Photos and feedback is welcome.
PS: This version is smaller in the outer diameter and taller overall. For a better fit on the default bolt a few turns of tape on it could be needed.
You can see the configs I used to print this from Cura on the photos.