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gnitseretni
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Crap, I meant 9 inches square (9X9). Sorry, everybody! 
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Rosco Bodine
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I mentioned lexan sheet which may be flat enough as is, but since it is
flexible, you could use shims or adjustment screws bearing upon the underside of the lexan for curvature correcting any bow, if it was secured to a
rigid backing plate by its corners. A mounting frame with a "stadia" wire used as a straightedge
could be used as a Glint indicator where you could see daylight reflection under the wire as you visually check the surface flatness crossways in
something like an asterisk pattern, gauging the surface with the taught wire.
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gnitseretni
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Lexan wouldn't work. The bed is heated from underneath with resistors, to about 70C. The bed is heated so the printed part doesn't warp. It needs to
cool off slowly.
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dann2
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A book, Amateur Telescope making my Albert G. Ingalls, describes making optical flats from glass and metal. These thing can be made to millionths of
an inch using elbow grease and time.
Will post some photo of pages if you want.
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gnitseretni
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Nah, I think I'll just get that plate from McMaster that I mentioned in my first post.
Thanks though.
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