I went over to see a guy called Chris at the eXtrodinary Laser Company last week. He just bought a laser too and that laser company recommended making some of these nubbins to keep the work lifted off the honeycomb. It's a good idea now stolen by me :) suitable for the LS3020 honeycomb bed (svg here).

(edit, 20th Jan) These nubbins are also doubling up on the underside of the honeycomb as a secure way of lifting the honeycomb off the bed so the vapour isn't trapped in the comb.