Hi Michael,

if you select other hexagonal pieces and try to perform fillet on them (let's say 0.2) you may not get a fillet!

Important: I don't want the inner edges to have fillets (simply because they are not visible) So please select a face (just outer Hexagonal face) and try to fillet it I believe fillet won't work!

And one more thing when you select all hexagonal shapes and fillet them then you cannot Boolean Union them. but if you don't fillet them Boolean Union works.