A constant section beats a clever gate for flatness

Tapering the web to a constant 4.5mm and dropping mold temp 15C. Flatness went from 0.42mm to 0.15mm across 110mm.

Nothing was tried on the gate, and that was the right call. The bow was a cooling gradient, not a fill problem.

The temptation was to add chills to the thick side. Making the section constant removed the gradient entirely and cost nothing in tooling.