I used some stencil plastic to cut out my hexs. I put a hole in the center with a standard hole punch. After hexs are sewn on all 6 sides, you can easily pop the plastic out and use it again.

:( I'm pouting. My order was to arrive today, it is sitting in a UPS facility about an hour away and they changed the delivery date to tomorrow.

I feel like a kid that's waiting for Christmas morning to arrive.

Thank you everyone for all the great ideas on what to use!