Here are the instructions for the first new path separator in my knex ball machine Paradox
The stacker separator stacks 2 balls, then a third one enters and all balls exit the separator at once.
You can also give this separator 2 entrances if you want (intro picture 10)
As you can see, the mech is 1 blue rod by 2 white rods and a blue rod: not perfect to implement in a standard red rod ball machine. So I also made a frame, that way it's easier for you to attach it in your own ball machine.
If you build the separator, read every image note, they're very useful!
Thanks for watching / building!