Working with carbon fiber.

The G10 is tough stuff. I have a couple of pocket knives with G10 scales and use them to open beer bottles all of the time, with no appreciable damage.

[pb4ugo]

Like others have said, the Dremel with some tape over the cut works well.

For those of you that want repeatable cuts (or just can't do a straight line with a Dremel like me) fiberglass router bits are the hot ticket.