Im interested whats the ID of the jets? 0.10mm wall thichness, you must have a lot of jets on this one then!
I havent used polycarb yet but polyethelene would seem to be a lot less brittle and wont crack when drilled/overtigtened/machined, dunno how well it would work so with holes so small though. The stuff I have is translucent though and clear would be best for blocks...
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