Every mold change made after steel is cut costs money and days. Design for manufacturability — DFM for short — is the review that catches those changes while the part is still a 3D model. It is not a formality at the end of a project; it is the step where tooling cost is actually controlled.
Our product development team runs a DFM pass on every part before a toolmaker ever quotes, because the cheapest change is always the one made on screen.
What a DFM review actually checks
A good review walks the part feature by feature and asks the same four questions: can it be molded, can it be ejected, can it hold tolerance, and can it be made cheaper without losing function? In practice that means:
- Wall thickness. Constant walls fill evenly and cool without sink marks. Ribs should run at 50–60% of the wall they support.
- Draft angles. A half-degree of draft on a textured surface or a tall core is the difference between smooth ejection and a part that sticks.
- Undercuts. Side actions and lifters add cost to the tool. Often a small redesign removes them entirely.
- Gate location. Where plastic enters controls weld lines, warpage and appearance — it is decided in design, not on the shop floor.
Where the cost really hides
Tooling cost is rarely driven by size alone. The expensive line items are tight tolerances on non-critical features, polishing on surfaces nobody sees, and slides that could have been avoided. A DFM report puts a number on each of those choices, so you can decide what is worth paying for — before the mold maker does.
What you get back
A completed DFM review returns a marked-up drawing, a list of suggested changes with reasons, and a quote that reflects a part designed for the process. That is why we run a complimentary manufacturability review on every inquiry: the earlier the review happens, the more it saves.
If your next project is still in CAD, that is exactly the right time to talk to us. Read more about how we work in our approach, or see the processes the design will eventually run through in our capabilities.