Open source hardware

Open source hardware is defined by the Open Source Hardware Association as a term for tangible artifacts - machines, devices, or other physical things - whose design has been released to the public in such a way that anyone can make, modify, distribute, and use those things.

Without restrictions
Releasing designs under a CC-BY-NC-SA licence, preventing commercial use of them is not compatible with the OSHW definition.

Documentation must be easily obtainable, design files must be in CAD format and not in an intermediate format such as PDF.