How to make a prototype

A prototype proves your invention works and shows people what it is. Start rough and cheap, learn fast, and only spend real money once the design is settled.

1. 01Define what the prototype must prove

   Pick one question: Does the mechanism work? Does it fit the hand? Will people want it? A "looks-like" model and a "works-like" model are often separate builds.

2. 02Sketch and model it in 3D

   Draw the main parts with rough dimensions, then build a 3D model so you can see how pieces fit and move before cutting anything.

3. 03Make a parts list and budget

   List every part with quantity, material, estimated cost and where to buy it. Add tools, shipping and a buffer — first builds usually cost more than planned.

4. 04Build a rough version

   Use cardboard, foam, wood, off-the-shelf parts or 3D printing. Speed beats polish at this stage.

5. 05Test it safely

   Write simple pass/fail tests, wear proper protection, and be careful with heat, blades, batteries and mains power. Record what failed and why.

6. 06Refine and repeat

   Change one thing at a time and keep each version. Most products go through several rounds before they work reliably.

7. 07Prepare for a manufacturer

   Once it works, make a cleaner model with final materials and dimensions. Protect it (see how to patent an idea) before sharing it with product design firms or factories.