Wall Thickness Wall thickness for thin parts such as a soda bottle or ball point pen ink inserts are quite possible and economical. Thick wall sections are possible as well. Uneven wall thickness present challenges to the plastic molder manufacturer. Designing your part with uniform walls and cross section will simplify manufacturing and costing. Thick walls cool slower and greater shrinking will occur.
Thin walls cool faster as thus, less shrinkage.
Radii and Corners Maintain uniform wall thickness at corners. External and internal radius should share the same center point . When significant stress is present, design in larger radius as larger radius distributes stress uniformly. Taper of 1 deg. is typical. Excess rib height combined with taper will produce thin sections requiring extra fill time at the mold .