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A few aspects should be considered in mould fabrication

During the fabrication of injection mould, 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. At wall intersection or "tees" sinking will occur. Thick walls cool slower and greater shrinking will occur. Thin walls cool faster as thus, less shrinkage.

Maintain uniform wall thickness at corners. External and internal radius should share the same center point . External radii = internal radii + wall thickness. The minimum radii should not be less than 1/4 minimum wall thickness. Design for radii to be 1/2 to 3/4 of the nominal wall thickness. When significant stress is present, the mould design should be in larger radius as larger radius distributes stress uniformly.

Ribs should be 1/2 to 2/3 of the nominal wall thickness and less than 3 times thickness in height. Taper of 1 deg. is typical. Note: excess thickness promotes shrinkage. Excess rib height combined with taper will produce thin sections requiring extra fill time at the mold .

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