Made for my Mini+. I found that magnets want to stick to the edges of the opening instead of the spinning part in the middle. I noticed the top of my Z axis rod had a small 2mm hole in the center of it so I modified this to press into that instead of using a magnet to connect. I also flattened the base and added a small offset so it could sit high enough. 

You probably need a support for the press fit nipple. Everything else prints fine as is.