PMMA is absolutly not a problem in this case. Middle plates don't have any constraints on them, no threads, etc. Just a sandwich between 2 others plates, no risks to break it in any manner (I got one in my hands, thx Bruce)... A lot of people use acrylic in WB, reservoirs or others products with no problem (me too and never got problems even with lot of constraints with conical barbs near plate edges). There's so much kind of plastic that you can't make a global statement like "use Delrin instead of acrylic, it's better", this is BS because it depends of the context. I believe this madness about Delrin on US forums (generally) comes from Cathar with his Delrin Storm plate, no ? Is everyone should use Delrin now and copy him ?? No way to do such, good for his design but not an obligation. Use polycarbonat like Makrolon if you want another plastic, virtually unbreakable but a bit pricey, quality has always a price.
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