This is a model I designed for my dnd group to hold up to 21, ten to thirty-two mm miniatures. It's designed to be used with a disc spindle, unfortunately I was unable to find the original one I purchased, but the following link should be a good analog: disc spindle. This design could however also be used without the protective spindle. The “mini holder core” is a difficult print, it will print better if you set bottom layer lines to alternate by 45 degrees. The “dice holder” can be assembled and will screw into the core. The top of the mini holder screws in via threads and the handle can be press fit and glued into it. Finally, the miniholder clamps can be slid in and out after a bit of cleanup and they will hold miniatures securely when you press fit them to the base, you will need to print 21 of these (there is a thicker and thinner version depending on printing tolerances).
The author hasn't provided the model origin yet.