I made this I was fed up with trying to home one at a time 30mm blank at a time the hole is 30.5mm with a 20mm finger hole for poking them out and keeping the blanks cool.
Made with 3mm x 2 basswood ply scrap, big enough to be pinned and held tight on the honeycomb
3x Canvas one for back, one for front and the 3rd are both combine so they can be cut straight from and 3mm A4 Basswood ply or MDF that's required, small amount of wood glue needed, I also use G-Clamps to add a little pressure to help the wood stick.