I took an idea from a former classmate to create an ergonomic handle that could have multiple heads that could do any gardening project imagineable. I modified an existing pruning hook and cultivator rake stl to fit the handle I designed. The source code from the handle is attached, as well as the base to any new head if someone would like to add to the collection. For further instructions and bill of materials please see: http://www.appropedia.org/Update_to_Changeable_Garden_Tool_Heads