To get a prototype made, you have four realistic routes: build it yourself with off-the-shelf parts and hobby tools, send a CAD file to an online fabrication service, hire a freelancer to design and build it, or engage a product development firm that handles design, engineering, and fabrication end to end. Which route is right depends on whether you already have a manufacturable design, how complex the product is, and what the prototype needs to prove. Here is how to choose — and what each path costs.

First: know what your prototype needs to prove

A prototype is a question made physical. "Does this mechanism work?" needs a rough functional model. "Will buyers want this?" needs a polished appearance model. "Can this be manufactured?" needs a production-intent build. Defining the question first prevents the most common money-waster: paying for a beautiful, expensive prototype when a $50 test would have answered you. The stages and their budgets are broken down in our guide to the cost to make a prototype.

Option 1: Build it yourself

For simple concepts, DIY is unbeatable for speed and cost. Foam, cardboard, hardware-store parts, a hobby 3D printer, and electronics platforms like maker-grade microcontroller boards can produce a convincing proof of concept for under a few hundred dollars. The limits arrive fast: no professional CAD, no engineering analysis, and a build quality that cannot go in front of investors or retailers. DIY is a first step, not a destination.

Option 2: Online fabrication services

If you already have a CAD model, online services will 3D print, CNC machine, or laser-cut your parts and ship them in days. Prices start at tens of dollars for small printed parts. The catch is the "if": these services fabricate exactly what you upload — they do not design, fix, or engineer anything. Garbage file in, garbage part out. Our comparison of 3D printing services for prototypes covers the technologies, materials, and turnaround times, and the broader menu of processes lives in the rapid prototyping pillar.

Option 3: Hire a freelancer

Freelance CAD designers and engineers can take you from sketch to printable file for anywhere from a few hundred to a few thousand dollars depending on complexity. This works well for single-discipline jobs — a purely mechanical part, an enclosure, a simple assembly. It gets risky when the product spans disciplines: a connected device needs mechanical design, PCB design, firmware, and antenna work that one freelancer rarely covers, and you become the project manager gluing four contractors together.

Option 4: Engage a product development firm

An engineering firm takes responsibility for the whole outcome: requirements, industrial design, mechanical engineering, electronics, firmware, fabrication, and testing under one roof. Expect functional-prototype projects to run from a few thousand dollars for simple mechanical products into five figures for electronic and connected devices. You pay more than the freelancer route, but you get engineering accountability, a design that can actually be manufactured, and one partner instead of five. This is the right route when the prototype is a stepping stone to production, retail, or fundraising — the full picture is in our prototype development guide.

How to start, whichever route you choose

  • Write a one-page brief: what the product does, who it is for, target size and price, and what this prototype must prove.
  • Gather references: sketches, photos of similar products, and any measurements you have.
  • Protect first if you plan to share widely: a provisional patent application is the inexpensive way to secure a filing date before disclosing your idea broadly.
  • Budget for iteration: version one will teach you things; version two will work. Plan money and weeks for at least one rebuild.

Get your prototype built by engineers

Projects House builds prototypes for US inventors and companies daily — from first CAD model to working, testable hardware, with mechanical, electronic, and firmware capability in-house and fixed milestone pricing so costs are known before work begins. Send us your idea through the contact form, and we will tell you what kind of prototype you actually need and what it will cost — the consultation is free and confidential.