◆ Idea → Product

An idea for a device is where I start

You know what the device should do and who it is for. I turn that into a product: a written brief first, then the form, the 3D design and a model a manufacturer can build. You do not need a finished board to start.

Latest note · 23 October 2026: Heat decides where the board can go · all notes

Idea Brief Concept 3D Design DFM
# focus dock / passive cooling
load 6.5 W   peak 40.7 °C
rise ~20 °C over ambient
draft analysis 0 undercuts
CFD at full load, no fanFIG. 01
Focus Dock 3-in-1 wireless charging stand, transparent shell showing coils and PCB
SolidWorksBlender Injection mouldingSheet metal CFD thermalSTEP / STL / PDF

01 — The work

What the difference actually looks like.

Focus Dock, a 3-in-1 wireless charging stand. Every decision below is one a prototype does not have to make and a product does.

Decisions a prototype never has to make

A second dock position that hides the phone screen instead of showing it. Wood-grain mold finish on the structural spine against matte black on every contact surface, so the material change tells you where to put things. Vent channels sized from measured heat rather than drawn for looks. None of it is necessary to make the thing work. All of it is what separates a product from a prototype that happens to function.

Focus Dock in focus-mode position with phone docked
THERMAL_VALIDATION CFD
Peak40.7°
Over ambient~20°
Dissipated load6.5 W
Phone coil3.0 W
Watch + earbuds1.25 W ea.
PCB regulators1.5 W
Undercut faces0
Vents placed from these numbers rather than estimated. Stated as rise above ambient, which is the only honest way to state it.

Five parts, built to be assembled

One structural body, thin surface covers per contact area, and coil sub-assemblies that install without disturbing the rest of the housing.

Focus Dock exploded view showing five-part construction, coils, PCB and fasteners

The catch that paid for the whole review

The USB-C input fouled the phone in the focus-mode position. Found during review, moved to the rear. Cheap to change on a model. Expensive once the mold is cut. Draft analysis then came back with zero undercut faces, so it releases from a standard two-plate tool.

Focus Dock cutaway view showing internal component layout

Read the full case study

Four colourways, exploded view, x-ray cutaway, compliance label and the thermal work, published on Contra.

Open case study

Why I do this

I translate ideas into shape.

The best part of this work is the first call, when someone describes a device that does not exist yet. They know what it should do and who will use it. What they need is someone to give it a shape that a factory can build.

A product cannot introduce itself. Its appearance does the talking. The shape tells you where to push and where to grab, whether it is tough or delicate, whether it is built for the wilderness or a living room shelf. Nobody needs a manual for that, because the form already said it.

Founders know what they want the product to say. They just do not speak shape. I do, and I translate from the idea to the form. The result looks good, tells the truth about the product, and a factory can build a thousand of it.

ASCII art: scattered dots resolving into a solid enclosure

02 — Pricing

Published prices. No quote required.

Fixed scope, fixed timeline, fixed price. Every project starts with a brief, and each step builds on the one before.

Start here

Brief + Concept Direction, $300

Most projects come to me as an idea or a need: what the device should do, who uses it, where it lives. The first step turns that into a written product brief, so we agree on what we are building before anyone draws it.

From the brief I develop one concept direction with renders and a written rationale: why this form, what set the proportions, and which material and process it is aimed at.

7 days. One revision round. A 30-minute call to walk through it. From there, each step builds on the last.

 

Step 1 · Brief + Concept Direction

For an idea that needs a definition and a first form.

$300
7 days · 1 revision
  • Written product brief: users, use, requirements, components
  • One concept direction as 3D concept geometry
  • 2 renders
  • Written rationale for the direction
  • 30-minute walkthrough call
Start this step
◆ Where the model gets built

Step 2 · Developed 3D Design

For a concept that needs to become a complete, buildable model.

$750
14 days · 2 revisions
  • Everything in Step 1
  • The chosen direction developed into a full 3D model
  • Wall thickness, draft and split lines
  • Screw bosses and assembly features
  • 6–8 renders
  • DFM orientation notes
Start this step
 

Step 3 · Manufacturing-Ready Design

For quoting and producing. The package a manufacturer can price from.

$1,500
21 days · 2 revisions
  • Everything in Step 2
  • Manufacturing-ready model
  • Drawing set with tolerance callouts
  • Spec sheet a manufacturer can price from
  • Support through the manufacturer conversation
Start this step
Add-ons — priced up front, so nothing gets negotiated later. A new direction is quoted as its own project.
Additional revision$75
Additional render$50
Faster delivery$150
Technical call, 30 min (a specific issue)$50

03 — See the work before you buy it

Two real deliverables, free to download.

Sanitised versions of documents I send clients. Read them and judge the work before you spend anything.

Sample time & cost estimate

How a project gets broken into steps, what each one delivers, and what it costs before anyone commits.

Download PDF

Sample DFM review

What a design for manufacturing review actually says: wall thickness, draft, tolerancing, part count, and what to change before tooling.

Download PDF

04 — Scope

Who does what.

Clear lanes keep a project on time. Here is mine, and here is where specialists take over.

My part

  • Product brief. What the device does, who uses it, and the requirements the design has to meet.
  • Industrial design. Form, proportions, materials and finish, so the product looks right and works in the hand.
  • Product architecture. How the board, battery, display and connectors occupy a volume that can be built.
  • Mechanical design. Mechanical CAD, fits, tolerances, fasteners, seals.
  • Design for manufacturing. Wall thickness, draft, tolerancing, part count, assembly sequence.
  • Production drawings. The documents a manufacturer quotes and builds from.
  • Manufacturer coordination. Writing the spec they work to, and staying the single point of contact.

Specialists I work with

  • Mold and tooling engineering. The toolmaker designs the mold from my model and drawings, and I stay in that conversation.
  • Electronics, PCB layout and firmware. An electronics engineer builds the board. I design the product around it and keep the two in step.
  • Factory sourcing. A sourcing partner vets factories. I write the specs they quote from.

05 — Who you work with

Eugenio Cruz Cornejo

Industrial Designer · Electronic Product Design

I turn ideas into electronic products a factory can build. Clients usually come to me with a need and no product yet. I start with a written brief, then design the form, the 3D model and the details for manufacturing, across consumer electronics, battery systems, IoT devices and outdoor equipment.

Industrial Design · MBA · MSc Project Management · Tucumán, Argentina

The case study shows the technical side. These reviews show what working with me is like.

★★★★★
“Eugene was amazing to work with, quick to respond and a great listener. He went above and beyond on this project. Highly recommend, would 100% hire him again!”
Susan DriedgerQuality Suze LLC · Upwork
★★★★★
“Eugenio is without question the most experienced, skilled as well as dependable designer I have ever worked with.”
Barry GriffinAzimuth · Contra
★★★★★
“Working with Eugenio was a very positive experience. Def recommend him. Thanks.”
JulianOutdoor audio recorder · Upwork

10+ years as an industrial designer  ·  Clients on Upwork and Contra

06 — FAQ

Questions people ask before hiring me.

New to this? Read From idea to product: the steps, costs and timing between an idea and a design a factory can quote.

Who actually does the work?

It's an independent studio. I lead every project personally, take only a few at a time, and bring in trusted engineers when needed. You work with the person doing the CAD, so what we agree on the call is what gets built.

I only have an idea. Is that enough?

Yes. That is where most projects start. The brief turns the idea into requirements and a component list. Once the board is defined, the 3D design is built around it, and later steps are re-quoted if the board changes.

What do you need from me to start?

A description of the idea: what it does, who uses it and where. Any components you already know, sketches or reference products, your production volume if you know it, and a target timeline. The delivery clock starts when I have that and your files, not at purchase.

Can you take this all the way to production?

I take it to the point where a manufacturer can quote and build, and I stay involved through that conversation. The toolmaker designs the mold from my files, as described above.

How do revisions work?

Each step includes a named number of revision rounds. Beyond that, a round is $75. A new direction is quoted as its own project. Scope changes are quoted before they happen, never absorbed and billed later.

◆ Taking projects

Tell me about your idea.

Book thirty minutes. The discovery call is free. You will leave knowing what it takes to turn your idea into a product, what it costs and how long it takes, whether or not you hire me.

Email me instead
No preparation needed. Bring the idea, any sketches or reference products, and whatever you know about the volume you are aiming for.