PEEK is one of the most demanding engineering plastics to machine, and most quality problems start before a chip is ever cut — at the drawing stage. This DFM guide walks engineers through PEEK-specific design rules: minimum wall thickness, internal radii, depth-to-diameter limits, and thread design that respect PEEK's elastic rebound and low thermal conductivity.It provides realistic tolerance recommendations by grade (virgin, GF30, CF30, medical-grade), explains how to separate functional from non-functional tolerances to control cost, and lists the five most common PEEK design mistakes with practical fixes. A pre-submission checklist and FAQ help you catch risk before quoting — so your PEEK parts come out dimensionally stable, warp-free, and economical to produce.

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