The version with the hole for the magnets can hold four 5x1 round magnet stacked on each other, but i included the .f3d file if you want to modify it to fit other sizes.

Be careful if you want to size it down because i don't think the joints will be strong enough to not break if made smaller, but scaling it up should be fine.

It doesn't need supports and shouldn't need a raft (i printed it fine without it).