i dont see that it should be that hard to do on a manual mill, by my counting it would require 26 passes, all straight lines. you would want to only do about 5 passes per day though i rekon, otherwise you would start to rush it and not align everything perfectly. i dont have a small enough mill bit though, the smallest i have now is a 3mm, prob need a 1.5 or something.
it could be simplified a lot by making it a grid array of jets rather than honeycomb, but i think that the honey comb will allow the water to flow away much easier without impeding the other jets.
but cathar has said that his 'final' version will have more densly spaced holes - requires even more passes. i think i would be willing to experiment with something like the size of his current one.
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