Adapter for a makita 14.4V battery pack to connect 12V stuff. It has a Normstecker connector. With this connector and/or a optional cigarette lighter adapter many things and other adapters can be connected.
I plan to publish the openscad file too, but i have to clean up it first ...
3D model STL: adapter_makita_batterie_normstecker_normbuchse.stl
Images of prototype: