I find it a great convenience to be able to machine-plane boards on edge, and all you need is this simple three-piece jig. I use melamine-faced particleboard to make the side walls and base of the jig because it stays flat and is slippery smooth. Clamp both sides of the jig as shown (adjusted to the thickness of your stock) to the planer table on both the infeed and outfeed side. The walls of the jig form a tunnel through the planer to keep narrow boards standing correctly as you feed them through.
– Stephanie Bourque