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$f(6) = 13$ with a cake of size $210$ and piece sizes: $$\{3, 5, 8, 10, 12, 13, 17, 18, 20, 22, 25, 27, 30\},$$ where $$17+25 = 5+10+27 = 20 + 22 = 3+8+13+18 = 12+30,$$ $$10+25 = 5+30 = 3+12+20 = 17+18 = 13 + 22 = 8+27,$$ $$5+25 = 3+27 = 10+20 = 12+18 = 13+17 = 30 = 8+22.$$ It was computed with via solving MILP as explained in my other answer.