Our friends from the OYA magazine along with Prof. Dr.-Ing. Ralf Otterpohl from TU Hamburg started a fundraising to open source a soilfeeder pot and a juice extractor.
http://www.startnext.de/bodenfuttertopf-und-saftpresse
You can see the working mechanism of the soilfeeder pot in Terra Preta Sanitation – 6. Highly productive organic farming. Its principle is introduced by the permaculture pioneer Herwig Pommeresche.
We are documenting other manual work machines for the garden in the Wiki that need to become open source.
