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The foam itself is enough. It's cut to the curved edges of the DX so the corners, where it's just slightly thicker due to the curve, supports it quite well, and sends some of the support into the sides a bit. The foam does flex just a bit on the bottom (maybe 1/16 inch) but the glue that I used is specifically designed for craft foam (Craft foam glue from Beacon) and holds very well, it hasn't separated at all and is quite firm. The other edges I have not seen any flexing at all.
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