[Puzzdre]

I don't have the drawings, but have the finished block. Its also made mostly with drill press, drilling and cutting, but this mk2 involved cutting with one 2 mm mill bit for wider channels than cutting with dremel discs (approx 1 mm channels).

The block is drilled only on the bottom side, the top part is flat, only barbs.

The barbs are 10 mm inlet ID, 12 mm ID dual outlet.

The bottom part is made of 10 mm thick chunk of copper, drilled with 3.3 mm drill bit, with variable depth in every circle of the holes, starting in center:

center of the block is 3 mm base, first circle is 4.5 mm, second 3.5 mm, third 2.5 mm and last (outer circle) is 2 mm base. Toward the outlets I raised the base thickness for 1.5 mm, from 2 mm to 3.5 mm.

The far out circle is cutted between the holes with 2 mm mill bit, also the perpendicular line dividing the block into two halves, through the center is also cutted with mill bit to 2 mm wide, trying to equalise the flow through smaller radial channels (1 mm wide) and the center of the block...

The block is sealed with four Allen bolts and bathroom silicone, bottom sanded to 1000 grit.

This is the bottom half of the block: