3D printable model of a Thumper from the movie Dune. A thumper is a short stake with a spring-loaded clapper that's placed in the sand to attract sandworms. The thumper vibrates and makes sounds that the sandworms are drawn to. When a worm emerges from the sand and charges at the thumper, a Fremen rider will fire grappling hooks into its body to open its breathing flaps.