Mechanical Design & DFM · Shenzhen, China

I review plastic parts before you cut steel.

Eleven years in Chinese manufacturing — five designing injection molds, two reviewing them, three designing complete products. I have sat on both sides of the drawing: the one who designs it, and the one who has to cut steel for it.

11years in manufacturing
5years designing molds
2years DFM review
3years product design

Services

Entry
From $299 / part

DFM Review

Send a STEP or drawing. You get a ranked risk list before tooling is committed — where the sink marks will be, which walls are too thin, where it will not eject.

  • 48-hour turnaround
  • Annotated screenshots
  • Fix suggestions, not just warnings
Core
Project-based

Structural Design

Full part and assembly design: internal stack, 3D, 2D drawings, BOM. Designed with the mold in mind from the first sketch.

  • Stack-up & tolerance analysis
  • Supplier-ready drawing pack
  • Tooling-ready for quotation
Full loop
Project-based

Prototype Build

Mechanics, PCB and firmware in one unit that actually runs — so you can hold it before committing to a development program.

  • 3D printed or CNC housing
  • Schematic & PCB layout
  • Firmware to first working demo

Why me

I have cut steel.

Most DFM reviews come from people who have never stood at a trial shot. I have — and I have written the correction that saved the mold.

I know the factories.

Eleven years working with Chinese mold shops and injection plants. I know what a quote really means and where the schedule slips.

Async by default.

Annotated drawings, short screen recordings, written decisions. No timezone calls required — you get the thinking in a form you can forward to your team.

Selected work

Consumer appliance

High-speed hair dryer

Internal stack: air duct, motor mount and vibration isolation, filter housing, magnetic nozzle. Taken from concept review through tooling to mass production.

Portable device

Handheld nail drill

Single-cell lithium pack, motor and spindle in a grip-sized volume, dust sealing at the spindle opening, button feel designed for high-volume assembly.

Architectural hardware

Window blind & dimming system

New dimming product designed to reuse existing tooling. Re-engineered the older model so new and old shared common parts, avoiding a new mold.

Tooling

Injection mold design & DFM

Five years of full 3D mold design — parting surface, core and cavity, cooling, ejection, gating — plus Moldflow analysis and trial-shot diagnosis.

How it works

You send the part

A STEP file, a drawing, or even a sketch and a photo. No template needed.

I reply with scope

Written scope, fixed price, delivery date. No discovery call required.

We work async

Annotated drawings and short recordings as the design moves. You see decisions, not meetings.

You get the pack

Source files, drawings, and a BOM you can send straight to a supplier.

Start here

Send one part. I will send back three risks — free.

No commitment, no sales call. If the review is useful, we talk about the rest. If it is not, you have lost nothing and learned where your part will fail.

hello@andfu.com