Continuing the discussion from Laser Thursday and Hello! – Leather & Acrylic Wallet & Keychains:
I figured I would start a new thread for this. I pretty much finished modeling @madebynick 's dividers in OnShape.
It took me forever to figure out constraints for the two intersecting curved slots, but I finally found a setup that works.
I don’t have time right now to experiment with adjusting the curves or lengths, but anyone is free to make their own copy and try it.