Partly done with freecad, partly done with https://github.com/fablabnbg/inkscape-paths2openscad/releases
This year we found the cookies to be too large. I am printing the following at 85% size:
owncloud_cookiecutter_io.stl is the best working tool. It is two parts, the outer frame for
cutting, and the inner pattern for embossing. They are separate, so that the actual thickness of your cookie does not matter, and also for easier cleaning.
The rectangular card shaped piece owncloud_cookiecutter_stencil.stl is a new addition,
it can be used as a stencil to smear some sweet icing onto the cookies, as shown in the first photo. Delicious!