Building a robotic arm? Answered
In Science next term, we've been told that we'll need to build a robotic gripper.
All it has to do is pick up a cup.
I've been having a look around, and the balloon idea isn't practical because if the cup was full it wouldn't work. And I'm okay with spending a little money, but I'd rather not spend $100 or anything on a kit.
So what's a good idea for me?