This should fit the coin chips from the popular tabletop game Smallworld See also http://www.thingiverse.com/thing:32253this should be compatible with the stackable version http://www.thingiverse.com/thing:32255 but I might have screwed up the position of the bumps that are supposed to connect it to its neighbors since I had to design it on its head (just my way of problem solving - I'm sure I could have made it some other way, but I'm still learning)This should fit 21 coin chips from the Smallworld set.I have no access to a 3D printer yet so all my designs are untested.As you may see from the screenshots I added this thing does not have the bumps on the back, so it's not connectable back to back - I omitted this feature because didn't know the correct measurments off the top of my head, so I procrastinated... Alsp this one is 2 mm taller than the others, while being 6 mm shorter on the sides, so it wouldn' t fit the race chip holders anyway. I might correct this flaw in a later version.