An Open-Source, Low-Cost Olfactometer: Design, Fabrication, and Performance Characterization

Abstract

Objective: This paper presents the design, fabrication, and technical validation of a low-cost (<$50 USD), open-source olfactometer. The device addresses the prohibitive cost barrier of commercial systems, enabling accessible research and screening tools for olfactory function.
Methods: We detail the engineering design, bill of materials (BOM), and assembly protocol using globally available components. System performance was characterized by measuring environmental stability (temperature, humidity), odor delivery consistency, and chamber purge efficiency in a controlled pilot test.
Results: The prototype maintained stable environmental conditions (26.3°C ±0.5°C, 71.3% ±0.4% RH). Odorants were successfully delivered and subjectively discriminated. The integrated purge system achieved clearance within 3.18 ±0.20 minutes, confirming rapid reset capability.
Conclusion: We provide a fully documented, replicable design for a functional olfactory testing platform. This work establishes a foundation for community-driven development, adaptation, and validation of low-cost sensory testing tools.