This was a DIY project I made back in 2015. More and more I found myself having to roll a lot of dice at once for multiple attack rolls, saving throws, damage. It ended up taking a lot of time at the table, so I tried to come up with a way of speeding things up.
Enter the Polyhedral Pop-o-Matic!
These things are actually really simple to make, and can be assembled for less than $20.
1. Find yourself a set of miniature ttrpg dice (8mm or smaller). Make sure you have one of each kind, plus two d10's.
2. Go to a thrift store and buy a used copy of the board game Trouble (sometimes called 'Pop-o-Matic Trouble'. It's a big ol' clear plastic board with a dice pop bubble in the center.
3. Use heavy duty metal shears or a jigsaw to cut out the pop-o-matic bubble from the board.
4. Carefully use a screwdriver to pry open the bottom plastic panel of the bubble. Once open, you can get rid of the original six sided die and put your nerd dice inside.
5. Seal up the bottom with either hot glue or clear packing tape, always making sure the metal sheet inside is still able to pop and bounce.
6. Voila! You have your own polyheral pop-o-matic! Handle attack rolls and damage with a single pop!