Lò xo đặc cải tiến cho Catapult

Made the springs solid pieces to 1, stop them from slipping off the arms, and 2, to add a lot more tension to the catapult when its cocked back. Still playing around with the infill but currently its at 20% and this thing is incredible! 

This remix includes the spring and the support arms. The pegs have been replaced with pins, found in the spring file.

Our model was made at 200% size of the original by @uhltimate_548874