So far I did not have any problems with flashbacks. I don't place my acrylic directly on the honeycomb - I have a plastic grid, something like a plastic honeycomb about 15mm high, that I got from my dealer when I bought the laser. With that I have the poblem though that the edges of the acrylic are sometimes clouded also the plastic grid didn't withstand my machine for too long so I have it already in a couple of pieces.
A couple weeks ago I read a thread by Dave - he wrote that he uses rivets, that works excellent and Frank's tip with the golf pegs is a very good one too. You can place them on your table wherever you want to and you also have clearance underneath, so your exhaust can blow out the fumes so theay don't settle on the acrylic.
Andrea
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LaserPro Spirit 40 W
OKI ES9431
Who wants to hear the bells must pull the rope
Wer die Glocken hören will muss am Seil ziehen