I think you refer to this pic, dont you?
i milled the outer of the jets with a 1.2mm Drill, but there were some problems as you see they are far from perfect. first i made the mistake that i milled between the jets before drilling the jet holes (that did make the plastic less solid and reduced the accuracy of the drill for the holes) and i mistook the 1.2mm bit for a 1mm, so the walls of the jets are far too thin. you can see clearly on that photo, that some jets are broken others have very very thin walls. I need to redo the acrylic acelleratorplate sometime
The holes in the base are 2mm in square, and the base is also only 40*40mm so its a very lowscale waterblock. Now i would use a bigger and thicker base with some more jets and aproxximately 50*60mm but same 0.8mm jets and 2mm holes. I know that would be super restrictive, but only then i can achieve the best jet density.