It seems like every house with kids has one of these Leapfrog FridgePhonic's toys on the refrigerator, passed down through generations, and almost none of them have a complete set. So I scanned one and used it as a guide to make the full set.
With decent bridging these print without supports.
There is a recess in the back for a 10 x 20 X 1.7mm magnets (like the one found here: http://www.dx.com/p/20-x-10-x-1-7mm-ndfeb-magnets-silver-10-pcs-377589 ). If a different hole is needed it is left as an exercise to the reader to do that. Tip; do not just glue the magnet in however you want, make sure the poles align with the magnet in the back of the main unit before gluing them in or they'll fight being inserted into the unit.