Google is leaning into the Fitbit Air’s swappable pebble design to let anyone make their own accessories. This move is rather Google-y and reminiscent of the company’s earlier days.

Noting how the “community has already come up with innovative and creative new ideas to make the Fitbit Air [their] own” since launch last month, Google is “officially releasing the hardware specifications and accessory design guidelines for the Fitbit Air tracker to the public.” For example, owners have already found their own bicep band solutions.

This information would typically just be available for third-party accessory companies, but Google wants to open things up to “independent designers and artisan makers.”

Google today released Fitbit Air 2D CAD drawings [PDF] of the pill-shaped pebble that houses the sensor and the “sleeve” used by the Performance Loop Band.

These CAD drawings include crucial mating dimensions, tolerances, and mating force specifications – including attach and detach force – to help you build a high-quality accessory band.