simple flat cylindrical game pieces

OK, this customizable thing is near completion.
Defaults for each piece are 30mm diameter and 2mm tall, though these are adjustable parameters.
Defaults parameters for the grid are now 4 rows and 5 columns, for a total of 18 pieces ( rows x columns minus one for every even counted row). I also tightened the inter-piece space to 0.02*diameter from 0.05, which should also these 18 pieces to be printed on my Flash Forge with 4"x6" print bed.
It will create a grid of separated flat game piec