Originally Posted by Irvin
Starting mains and crosses with flying clamps is a problem because you need to string to clamp. You can't just clamp one and expect the clamp to hold it.
I can't speak for all flying clamp machines but Klippermate provides a small metal start pin that you feed through a hole to start the mains. I don't see why starting crosses would be a problem with flying clamps, at least it wasn't for me.