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Avoid shapes that are impossible to remove from the mold.  Lighter colors hide flow patterns better than dark colors. Choose the right material from the table on the right. Drawing dimensions should be of the final part - material shrinkage will automatically be considered in the design of the mold. Use raised text instead of recessed text when possible. Where walls meet at a 90 angle, round inside and outside to at least .05" radius - sharper outside corners can create molding problems and sharper inside corners will increase tooling cost. Keep holes at least .015" from edges. It should not be possible to fully hide a 0.3" diameter ball anywhere inside the material.
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