Hi everyone, last weeks i thought about improving accuracy on the arm, one friend told me about putting springs so i read about this and it's a very good idea, putting some springs, motors needn't to work so hard, and can pick up more weight. i tried to make some skeches. It's only an idea and not the final result. what do you think about this? the motor would connect with the lowest gears with a gear ratio of 1/9.

And with this gears i can make force in both of direction, not only elevating.

I uploaded the file to my repository if you want it.

See you soon!