As promised here are the dice towers I made... Tabletop games like Dungeons And Dragons, Shadowrun, Paladium and some board-games require quite a few dice. Now normally you roll them and they scatter on the table. Sometimes they can fall, get lodged in the blouse of attractive female gamers and so on. A flubbed roll can be a major source of contention with competitive players.
So the community came up with these designs and released them to Thingiverse. Thingiverse is a major repository of ideas, models, designs and concepts. Most are ready to print or manufacture.
You drop the dice the top, a series of baffles roll the dice randomly and they collect neatly in a tray. No more dice under the table, stuck in cleavage, flying across the room never to be seen again or landing in the snacks. I hate when that happens!
My customer wanted two towers, sent me the links to the files and I printed them out.
Here they are side by side, about six inches tall.
This one is green PLA plastic and glow-in-dark (GID) PLA/PHA. PLA is made from lactic acid which is often derived from corn, soybeans and other biomass as a byproduct of processing them. PLA is fairly common now, it's related to the soft-drink bottle material and leisure-suit wonder-material PET... PHA is a unique polymer that is basically made from a bacterial process. ALL of these materials (PLA,PHA, PETG) are known as Polyesters. Yes the same as the fabric. That's just really tiny fibers instead of a molded product.
Blue PLA, glow-in dark trays...
Here is a shot of the blue one being printed.
And the green one being printed.
Witty comment goes here.
Basically we take material and lay it down layer by layer and build objects. This is opposed to the traditional method of squirting materials into molds or using machines to remove material. 
