And now that I know that they are called “accordion bellows covers”, a little googling tells me there should be a way to procure some of the right size for the shapeoko. No way I want to spend hours origami’ing them by myself, but I can’t seem to find any relevant link on the forum to buy them. Too specific ? If anyone gave this some thought already I would be happy to hear about it.
Re-posting this image from the shapeoko wiki just to give people a sense of how cool (weird?) that would look: