I’ve tried a variety of materials (wood, plywood, acrylic), and my best result is from solid 1/4" wood. It takes longer to give it the smooth edge shaping than it does to cut and engrave this.
Works great! Nice balance and feel in the hand. I’m using really thin yarn (10/2 cotton, like for crochet), but thicker yarn would work even better. The design allows you to advance your weft yarn while still keeping it under control.
Shown on the loom is a new rigid heddle reed for basic inkle band weaving. It’s most durable made from acrylic, not wood, but I learned not to use dark material. Even in good light it’s hard to get the yarn into the right position. Once that’s done though, it doesn’t matter what color it is.
Technically, you can use heddle strings instead of a reed, but anything that’s hard on my fingers I don’t use. I’ll design something to not use manual heddle strings.
I’m designing a 2-bobbin shuttle next, for my 15" rigid heddle. That will show up this evening; I’ve got an online class that will start soon.