Not strictly NXT, but there are some very cool mechanisms here in Philip Verbeek's GBC. This version is self contained (you couldn't hook it into a bunch of others without some modification) but it is very neat and tidy.
My favourite are the long yellow beams that 'walk' the ball along :) (1 minute in)
The V8 engine is a nice (if unnecessary!) touch :D
My favourite are the long yellow beams that 'walk' the ball along :) (1 minute in)
The V8 engine is a nice (if unnecessary!) touch :D