Gumball Dispenser Spacers

I needed to get my new LYPC Large gumball machine to dispense just one 20mm skull at a time. The one photo shows the spacer and one red skull in one of the three dispensing cavities with another cavity having both a skull and red gumball together in a non-spacered cavity.
Thanks to Emmett for talking up openSCAD. I downloaded it, got it up and running and got the spacer designed and printed within a couple of hours. And it was the right size on the first try!
So, I guess th