When molders troubleshoot cooling issues, they tend to focus on channel layout, Reynolds numbers, turbulence targets, or temperature deltas. But there’s a missing piece that quietly undermines many well-designed systems: the effect of the water manifold. In fact, most Moldflow simulations don’t model the manifold at all—and in many cases, that’s perfectly acceptable. But it does require an experienced engineer to interpret the results, or you risk making decisions based on a