[Wayne TenBrink]

Is there any difference between "plexiglass" and "acrylic"? I have seen stuff marketed as "plexiglass" that was very brittle and virtually impossible to drill holes in without cracking. We have had decent success with "acrylic" sheet (as marketed by Ace Hardware), for non-structural, flat panels that are well supported along the edges. It drills fairly well, and is quite flexible, but will break before it bends. In 2009 we had 3 large panels (30" x 44") of the stuff and they held up very well despite impacts that bent the supporting structure (yeah, I know - that was Lunacy and there weren't arms and impacts weren't like they are on carpet).

We have three small, non-structural panels of it on the robot this year (because I had a tightwad moment and it was in stock), and we are taking bets about how long it holds up. Will replace any broken sections with Lexan, though.