Design Tips

Get quick advice on creating plastic, metal, and elastomeric parts for 3D printing, CNC machining, sheet metal fabrication, and injection molding. Designing with manufacturability in mind can accelerate production time and reduce production costs.

 

Using Ejector Pins Properly on Molded Parts

The proper design and position of ejector pins can help minimize their effect on your injection-molded parts.
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Walls in any molded plastic part should be no less than 40 to 60 percent that of adjacent walls, and all should fit within recommended thickness ranges for the selected material.

Walls in any molded plastic part should be no less than 40 to 60 percent that of adjacent walls, and all should fit within recommended thickness ranges for the selected material.

The deep-rib approach (left) shows a box designed with walls as ribs, resulting in higher a cost to machine and polish the mold cavity. With the core-cavity approach (right), the box allows features to be milled with a faster cutter, and is easier to polish. This saves you time and money.

The deep-rib approach (left) shows a box designed with walls as ribs, resulting in higher a cost to machine and polish the mold cavity. With the core-cavity approach (right), the box allows features to be milled with a faster cutter, and is easier to polish. This saves you time and money.


 
How Draft Keeps Your Drink Cold

When developing parts for plastic injection molding, applying draft (or a taper) to the faces of the part is critical to improving the moldability of your part. Without it, parts run the risk of poor cosmetic finishes, and may bend, break or warp due to molding stresses caused by the plastic cooling.



 
Talking Cosmetic Defect Blues

Identifying potential cosmetic flaws like sink, knit lines, flash, blush and other issues early in the injection molding design process not only improves the appearance of your parts, but their overall moldability too.



Design Essentials

We've compiled our most essential manufacturing tips into three downloadable design guides on 3D printing, machining, and molding. Each looks at improving manufacturability, reducing production costs through design, material selection, and more.