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LEGO brick catapult
A 3D printed catapult that is LEGO compatible which allows to shoot LEGO bricks.
The shooting arm can be positioned at 3 different shooting angles, allowing for low and far shots (around 4m far) or high a short shots (around 1.8m far).
Check the link below if you want to purchase one.
https://www.shapeways.com/product/54FJRG7NU/catapult-for-lego-bricks