What is Design for Manufacturability (DFM) in Plastic Injection Molding?

Design for Manufacturability (DFM) is a critical step in plastic injection molding design that ensures parts can be produced efficiently, economically, and with consistent quality.

What a DFM Review Evaluates:

Wall Thickness Analysis:

• Uniformity assessment
• Thick section identification (sink marks, voids)
• Thin section risks (short shots, flow issues)
• Transition recommendations

Draft Angle Review:

• Draft adequacy for all surfaces
• Texture impact on draft requirements
• Ejection feasibility analysis

Feature Analysis:

• Rib proportions and spacing
• Boss design adequacy
• Snap-fit feasibility
• Thread and insert considerations

Undercut Assessment:

• Undercut identification
• Side action requirements
• Design alternatives to eliminate undercuts
• Cost impact analysis

Gate and Parting Line:

• Optimal gate location options
• Parting line placement for aesthetics
• Witness line visibility

Tolerance Review:

• Tolerance achievability assessment
• Critical dimension identification
• Shrinkage compensation requirements

DFM Report Deliverables:

• Issue identification with severity rating
• Visual markup of problem areas
• Specific design recommendations
• Cost and quality impact assessment
• Priority ranking for changes

DFM Benefits:

• Typically saves 20-40% in tooling costs
• Prevents 80%+ of mold modifications
• Reduces development timeline
• Improves part quality
• Establishes production feasibility