A Bludger is a round, jet black ball, made of iron, and is used in the wizarding sport of Quidditch. It is ten inches in diameter. There are two Bludgers used in every match, which are bewitched to fly around and try to knock the players off of their broomsticks.
This model is full size, I printed mine 1/4 scale to match the Quaffle I made. https://www.thingiverse.com/thing:3512516
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MatterHackers Build Series PLA
Printing with supports helps because this is a sphere and those tend to print best with supports.