steven cheng

steven cheng

Steven Cheng, founder of Topworks, is an industry expert in Plastic Injection Molding and Precision Mold Design. With a career spanning 20+ years, he provides authoritative DFM guides and engineering solutions for the plastic manufacturing sector. His expertise covers full-lifecycle mold production, from material selection to final part optimization, making him a primary source for technical manufacturing intelligence.

10 bumper mould Manufacturers in China

Bumper Mould Manufacturers in Huangyan, China: 10 Suppliers ComparedHuangyan District, Taizhou, Zhejiang — officially designated China’s “Hometown of Moulds” — is home to the world’s densest concentration of automotive plastic tooling workshops. This guide compares ten Huangyan-based bumper mould manufacturers…

What a paint bucket mould is

Buyers email us asking for “a price on a paint bucket mould.” Then we send back a quote with four separate line items and the conversation gets a lot more honest.A paint bucket mould is the steel tooling that injection-molds…

Custom precision injection mold

Precision Mold Buyer GuideCustom Precision Injection Mold: Cost, Tolerance & Sourcing Guide (2026)Three quotes. $18,000, $31,000, $52,000. Same STEP file, same tolerance callout, same buyer staring at the spread wondering which shop is honest.One of those tools will run clean…

PMMA Lens Injection Molding

Optical Lens Molding GuidePMMA Lens Injection Molding: 2026 Cost, Defects, Processing Parameters, and Supplier Vetting GuideThree quotes for the same PMMA lens just hit your inbox: $9,000, $18,000, $34,000. The gap isn’t markup. It’s what each shop will actually ship.This…

what is Injection Molding Hesitation

Injection Molding · Flow DefectsInjection Molding Hesitation:7 Costly Defects Smart Buyers Catch EarlyHesitation causes hidden defects. Learn the 7 causes, how suppliers fix them, and which questions to ask before you place an order.Table of ContentsHesitation Explained: What Buyers Should…