Caboose Puzzle Piece (for Fisher-Price Puzzle #508)

We have an old wooden puzzle for my son that is missing the last piece (a caboose for a train - see picture). A few hours later we have a replacement piece. I used Sketchup to design the piece, NetFabb Basic and ReplicatorG to repair and align the STL, Skeinforge to slice it and Pronterface to control my Solidoodle 2.