This is one of the simple bit holders I've made for the Dremel bits I have, its a simple block with holes for the felt and sanding discs and holes for the tool mandrils.
For now I have this simple one available but I do plan to integrate it into existing storage systems and perhaps make my own. I just thought sharing this would be nice even if only a few people would actually find it useful.
The author marked this model as their own original creation.