Robotics Rails

[Jodo42]

Also known as linear motion or robot rails. Like how a claw machine works. It's hard to describe, so watch a video:

Right now adding translation to robotics setups requires awkward piston contraptions. This kind of rail setup could be used for everything from robotic arms to heavy cargo landers. Not to mention potential uses as a monorail or train system, if scaled up. This sort of thing is technically already possible in stock, but wheels have always been lackluster in KSP and the setups tend to be high part count and low reliability.

Breaking Ground could use some pulleys, winches and ropes, too, but that's another topic.

[The Aziz]

With wheels, yep, it's hard, but we have some other rotating things. Servos n stuff. Combined with, idk, i-beams, they could work maybe.