Oh hey, what about wood?

[theshagsterofgames]

MDF warps and swells wen it gets wet. It is getting used more and more in house building because it's cheap. I truly hate the junk. It's the same junk that most school desk tops are made out of.

 

[LaughingCheese]

MDF warps and swells wen it gets wet. It is getting used more and more in house building because it's cheap. I truly hate the junk. It's the same junk that most school desk tops are made out of.

Uh, I'm not talking about using it to make actual armor, just the molds for the armor.

 

[Vrogy]

MDF warps and swells wen it gets wet. It is getting used more and more in house building because it's cheap. I truly hate the junk. It's the same junk that most school desk tops are made out of.

I have a feeling you're thinking of fiberboard.
MDF closeup: http://bellsouthpwp.net/l/j/ljfrank/MDF_edge.JPG
particle-board closeup: http://bellsouthpwp.net/l/j/ljfrank/particlebd_edge.JPG

Here's a topic over at the tk560 forums with lots and lots of MDF vacuforming bucks:
http://www.tk560.com/phpBB2/viewtopic.php?t=852

MDF is ideal for CNC because it's the same consistency, from piece-to-piece and throughout each piece. In addition, there are specialized woodworking tools to handle it, allowing quick, clean cutting.