Re: Primary support -update
You can also go to the supermarket and buy cutting boards. Of course, then
you'll have to cut it into strips, which is kind of a pain with PE, because
it melts and sticks to the saw blade.
PE will cut like a dream w/o melting if the blade is coarse. say
something like a 8 or 10 tooth (total teeth not per inch!) carbide tip
circular saw blade.
blades that cut acrylic and related materials will cause you trouble(ie
if used on PE.
i can supply tool geometry for sawing ,drilling,milling and the like if needed.