By Steven Cheng — 20 years in injection molding, tooling, and production sourcingThe bracket that cracked at 40 gramsA drone startup sent us a motor-arm bracket two years ago. The drawing had one instruction: “minimize mass.” Their previous supplier hit…
China Sourcing GuideMold Transfer to China: Ownership, Costs, and How to Move a Tool Without Losing the ProgramThe first mold I watched get transferred showed up at the new shop with a cracked slide and no ejector plate. The old…
For buyers new to injection moldingHow to Ask for an Injection Molding Quote (Without Knowing the Jargon)You have a plastic part in mind. Maybe a housing for a small device. Maybe a lid for a jar you sell. You email…
China Sourcing GuideMexico Buyer for China Injection Mold: The 2026 Tariff PlaybookThree of our last ten molds this spring skipped the United States entirely. They landed at Manzanillo. Then trucked up to a plant near Querétaro. The buyer was American.…
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China Sourcing GuideBuying Injection Molding Services in China: A Beginner’s Guide That Assumes You Know NothingBy Steven Cheng — 20 years in injection molding, tooling, and production sourcingThe deal changes character the moment your tooling deposit clears. Before that wire,…
The quote that told me everythingA US buyer sent me a drawing last spring. Housing clip, 0.4 g, PA66, 500,000 per month. Three Chinese quotes were already on his desk.The cheapest by far listed a single-cavity mould and a 12-second…
DFM CASE STUDY · POLYCARBONATE ENCLOSURE · 2-PLATE MOLDDFM Case Study: How We Redesigned a Polycarbonate Enclosure for a 1×2 Injection MoldEvery polycarbonate enclosure looks simple on the customer’s drawing. Uniform walls. Clean corners. A snap-fit lid and four bosses.…
Medical Device Molding GuideMedical Device Injection Molding: What Really Changes vs. Consumer PartsMedical device injection molding is the manufacture of plastic device components under a validated, documented, contamination-controlled process governed by ISO 13485 — not consumer molding done in a…
