I started with a coin customizer, it might have been https://www.thingiverse.com/thing:1275792, but I didn't like that the numbers went all the way through.
I designed the coins with a recess near the edge and recessed numbers. I was trying to come up with the design that would be visible on both sides of the coin, but that wouldn't need support for the bottom side. I think these look nice and match the Mario theme of the Monopoly Gamer game.
The size of the coins are nearly the same size as the cardboard coins that come with Monopoly Gamer.
The game comes with 50 one coins and 40 five coins. I also have a ten coin because sometimes that stack of 5s is too big.
Added a 1 coin with a wider 1 to better match the look of the others
I printed at 0.1 resolution, but it would probably be fine at 0.2
The 5 coins have some sharp burs that either need surface ironing or deburring to get them really smooth.