Building physical prototypes fast and cheap to test the right questions first
Designers Academy
21 October 2025 · 4 min read
In brief
Cardboard prototyping uses inexpensive craft materials to quickly build three-dimensional models of products, spaces, or service touchpoints, allowing designers to test physical interactions and structural assumptions early in the development process.
Cardboard prototyping uses cardboard, foam board, tape, and other cheap craft materials to build physical models of products, spaces, or service touchpoints. It applies the paper prototyping philosophy to the third dimension: get something in the user's hands as quickly and cheaply as possible, even if it looks nothing like the finished product. The material constraints of cardboard force designers to focus on structure and interaction rather than aesthetics, which is exactly where the most important design questions lie at the early stages of physical product development.
A cardboard prototype is a three-dimensional model built to test physical interactions, spatial relationships, form factor assumptions, or service environment layouts. It can represent a physical product (a medical device, a packaging design, a tool), a spatial configuration (a retail layout, a kiosk station), or an environmental design element (signage, wayfinding). Like paper prototyping for digital interfaces, it is designed to be thrown away: the learning, not the artefact, is the output.
Cardboard prototyping is essential in physical product design, packaging, spatial design, and service design involving physical touchpoints. It is particularly valuable in medical device design, consumer electronics, kitchen and home products, and any context where the physical ergonomics and form factor are as important as the functional specification. Use it whenever the physical experience of holding, operating, or moving through a design matters.
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