Building a Delta Robot: alternate design?

Sometimes I have to think outside the box.  I designed this to be a kid’s game at the Vancouver Mini Maker Faire.  Three people will have to move the red pieces in a team effort to move the blue piece to accomplish some goal (draw a picture, stack blocks, etc).  Notice that this version has a complete frame that rests on a table, while the earlier versions don’t.

It would be straightforward to add three motors that turn screws to move the red pieces up and down.  In fact, here’s a video of a Festo iFab 3D printer that does exactly that.

Tonight I will try printing parts again.  Wish me luck!