This is definitely a work in progress, so my ears are wide open to suggestions. Also, I'd love to see some variations, so here's the TinkerCAD page for anyone who wants to modify/play around with the basic design.
Allows the buyer to print up to 100 copies for home use only. Purchasers cannot distribute or sell the printed items and they cannot distribute or sell the digital design. If they wish to print more than 100 copies they must buy multiple licenses.