I used 10mm mill bit and I took 1mm off with each pass. Depth 1 mm was just enough for me, to handle it with bare hands. There were total 4 passes (4mm deep channel). For the back of the blok I took first pass 1 mm and then 0.5mm. (except pads for gpu and ram)
It took me around 2 hours for each block (just milling part)
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