The wobbling was in the previous iteration where the magnets from just the spheres weren't strong enough. I use ordinary ball bearings now and have the magnets separate and on the inside as shown. Recessing the pins and magnetic spheres in the original doesn't do much if your magnetic force is still too low.
Since my magnets around the hotend are towards the inside, they don't conflict w/ the magnetic arms. My biggest concern would be during detachment, but in that case, the arms should be pushing downwards on the effector, so there shouldn't be any concern for the magnetic arms to pop apart. That said, I'll probably transition to traxxas-style arms by my final iteration.
Since my magnets around the hotend are towards the inside, they don't conflict w/ the magnetic arms. My biggest concern would be during detachment, but in that case, the arms should be pushing downwards on the effector, so there shouldn't be any concern for the magnetic arms to pop apart. That said, I'll probably transition to traxxas-style arms by my final iteration.