K'nex Ball Machine Lift Instructions: Full Automatical Giant Ball Catapult--> View Instruction
This my new lift, the Giant K'nex Ball Catapult, in my room it shot to a distance of 4 meters (because my room is too small), but I think it must shot to a distance of 10 meters, it only contains a motor, it's totally automatic, the arm is tracted by a nylon cable, but the shot is very hard to regulate, because the catapult shot creates a role-back, and the elastics extend. But the final result is just awesome !!!
I've build a second version, it's a more economize pieces version, and I've add some improvement.
And now, get started to build it ! (it's the second version)