Laser bounce back when cutting acrylic on honeycomb

I’ve been watching Trotec’s videos and one suggestion is to use 3-4 layers of wet paper towels. Place the acrylic directly on that so falling parts are no longer an issue. I’ve only tested it once and plan on doing it again. Youtube video https://youtu.be/avYzp4YEpyI?t=2701 " Trotec Third Thursday: Laser Processing Acrylic". Paper towel tip starts at 45min in.

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