Ballista
thingiverse
Build Your Own Ballista! Don't Be Fooled by Over-Hyped Catapults! Print Out This DIY Model and Get Ready to Blast Friends with Tiny Trebuchet Targets! The maximum size of your projectile? A mere inch in diameter - small enough to fit on a keychain! Slide the track into its stand, secure it with a screw, load up your ammo, wrap a rubber band around the pegs and projectile, then pop that screw out to unleash the fun! Some assembly required, so don't say we didn't warn you. And as for injuries? Sorry, not our problem! You've been warned: friends may retaliate after the 48th marble strike!
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