Print with tpu, may work with other materials . 
I just wanted it to not clank together when useing the stop.
reqires 3 magnets.
magnet dementions 
10mmx5mmx2mm neodimium.

Print at 100%
with support evereywhere.

when mounting make sure the single magnet sticks in between 
the 2 magents on the opposite side (centered) .