I've used a ton of stuff to cut on including my leg (by accident). I have a small self-healing cutting pad I use most of the time now. I also use a blue form board a lot. Tip for people going to conventions, NARAM, or any other rocket event where you might find your self building something in a hotel room. The bottom of the dresser drawers make great building surfaces.

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Quando Omni Flunkus Moritati