He hit "simulate" at 3:15 AM. The flow front advanced like a gentle tide—smooth, full, uniform. At the final ejector stroke, the part dropped clean.
Plastic materials shrink as they cool. The mold designer must scale the cavity dimensions to compensate for this shrinkage. This is perhaps the most mathematically critical aspect of this injection mold design guide. injection mold design guide
The part shrinks onto the core side. Ejection must overcome this grip without damaging the part. He hit "simulate" at 3:15 AM