So I got an Ender 3 S1 and decided to print the “Coin” file that came pre-loaded with the machine. It printed perfect and did not have any supports to tear off the underside of the coins recess. How is this possible?
Hi @Darrin_Davis and welcome to the forums.
If the gap between parts is small enough the printer will happily bridge the gap and print without supports. The larger the gap the harder it will be for the printer to bridge across. In terms of the coin because it is quite small the bridging is easily accomplished with no supports required 
Looks good. Printed nicely. 
I wonder if the Creality Store will accept them…? 