This may not be THE way to do CPU blocks
but it worked for me after one modification*.
I cutted the base of block out of the copper sheet. This picture
is after the bending. The top lid is almost cut thru because the bend
would have been near impossible to get 90deg on top of the walls.
This is same picture but seams are welded. TIP: leave a air hole when
welding closed spaces. Its near impossible to get it airtight because air
expands when heated. Some welds can even explode if there are no air holes
(liquid metal is hot).
Here I drilled 8mm holes and fitted tubes for weld.
Both blocks are nearly done.
* The modification came afterward this picture. You have to get the
surface smooth that is facing the heat source. Also I looked some
commercial blocks and found out that those have 2-5mm metal layer facing
the heat source so I welded 3 x 1mm copper plates and
the top one of them was special. I sawed that of the sheet because if you
use scissors, it bends plate corners and then you have to use a lot of
sandpaper (more anyway).
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