Affordable NIR-HEG Biofeedback Device Kit/Assembled Unit

The user's creation of an open-source 3D-printed NIR-HEG brain scanner (Project OpenHEG) for a senior design project suggests there might be a market for more accessible and affordable fNIRS (functional Near-Infrared Spectroscopy) biofeedback devices. While the user shared their solution rather than a problem they're currently facing, such open-source hardware projects often point out where commercial products are too expensive, complex, or closed. There's an opportunity for either (1) a well-documented kit with all the necessary components for easier assembly of this or a similar device, or (2) a pre-assembled, user-friendly version. This would appeal to hobbyists, students, citizen scientists, or researchers interested in brain activity monitoring and biofeedback without the high cost or technical barrier of building from scratch or buying professional-grade equipment. The benefits could include making neuro-biofeedback technology more widely available, fostering innovation in personal health and cognitive training, and supporting educational uses.