Over at procooling.com, there is a member by the name of #rotor.  If you are into watercooling, the name is probably familiar, and here is #rotors latest project, with plans on his website, and at procooling too.
‘In the style of open source software, #rotor has produced a thriving community of “open source” shade tree machinists by making his waterblock designs and machining experience freely available on his website and our forums. The internal structure of the block is produced with a drill press and a Dremel, making it possible for those without CNC and end-mill access to still produce waterblocks on our own’.

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