The Beater's bat was a piece of equipment used by Beaters, in the game of Quidditch, to hit Bludgers away from their own team members and towards players on the other team. The bats were magically reinforced to give them greater strength.
There are to versions of the bat here. One has smooth transitions between the different materials making up the bat and the other has an "antique fit" between the pieces.
Let me know which you like best.
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Update: I've added the model broken up in different ways to support printing on different sized printers and in different orientations.