I'm seriously considering making one of these blocks.
However seeing as I have a Mill I would simply mill the area out side about 3-4cm square around the core to allow easy flow.
Now making it with a mill:
I can either drill all the holes and then join with a smallish bit. Or I could just make a crossgrid of channels?
Any ideas for a good Milled version?
I'll whip up a pic actually.
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