: 0.5° is the absolute floor; deeper features require up to 5°. Radii and Fillets
Aris remembered his part: a simple clip. He had used a single edge gate. That was fine for strength, but the flow front split and recombined around the boss, creating a weak weld line. That’s where it snapped. He needed to move the gate or add a small overflow well to trap the cold, recombined plastic. injection mold design guide
The mold is split into two halves: The (A-side, stationary, creates the outside of the part) and the Core (B-side, moving, creates the inside). Plastic shrinks onto the core. That was fine for strength, but the flow
Avoid sharp corners, which create stress concentrations. Use an internal radius of at least 50% of the wall thickness Ribs & Bosses: To add strength without adding mass, use The mold is split into two halves: The
Cooling accounts for up to 80% of the injection molding cycle. Inefficient cooling costs money. Mold design must prioritize cooling channels (waterlines).