OHRBIT is not your average summer hat.
 

This is a fully functional 21-channel EEG electrode cap — designed from scratch, built on hex-tile geometry, and yes, it sits on your head.

While everyone else showed up in straw and linen, OHRBIT arrived ready to record your brain waves at 250 Hz.

What is it?

OHRBIT is an open-source, 3D-printable EEG cap system built around the international 10-20 electrode placement standard. Each hexagonal tile holds an electrode probe directly against the scalp. Structural arc-beams connect the tiles along geodesic arcs, forming a rigid self-supporting frame that conforms to the shape of the human head.

The geometry is parametric — small adult and large adult variants are included in this release. Every radius, every tile, every beam is driven by variables. Your head, your cap.

This release marks a major milestone and includes

- Small Adult STL — ~54 cm head circumference

- Large Adult STL — ~58 cm head circumference

- Print-ready for PETG or PLA, 0.4 mm nozzle, opening facing up

- Make sure you have easy disconnecting supports, the center ground beam is very slim.

Hardware compatibility

Designed for the OpenBCI Cyton (ADS1299-based, 8–16 channels via Daisy). Signal rings in conductive PETG connect directly to standard EEG snap leads. DuPont 2.54 mm quick-connect pockets included per electrode tile — no soldering required for first tests. (Note, these features are not available in these Promo Files)

Print settings

| Setting | Value |

| :-- | :-- |

| Material | PLA or PETG (body)

| Nozzle | 0.4 mm |

| Layer height | 0.20 mm |

| Supports | Tree, contact distance 0.2 mm |

| Orientation | Opening facing up |

Status

This is Prototype v1 — the first complete STL export of the OHRBIT system. It prints, it fits, and the electrode geometry is correct (is it?!). Beam alignment and probe tower integration are actively being refined. Real hardware tests coming soon.

The parametric generator (OpenSCAD) will be released separately. Personalised versions for your exact head measurements — coming.

By OHRBIT

Open neuroscience hardware. Built in public.

*"Other people wear hats. We wear interfaces."*