hi jesus here is a way how to do it :
1 : create cylinder and sphere and bloon-union, trim with red line to make just half (surface sim should be where the red line is), shrink surface,
make blue lines where the end controlpoints is .
make green lines lenght =~= half Circumference off cylinder ( yelow curve )=( 3.14 x D) / 2
flaten the surfaces :
move end controllpoints off surfaces to end off green lines
trime with hexsagone pattern
move back the the end controllpoints and you should get good shape
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