3D printed solar energy trees are artificial trees for harvesting solar energy. The 3D printed stems and leaves are organic solar cells. The leaves, which are also known as solar panels, are power converters which harvest energy, and the number of solar panels determine the amount of energy harvested. The trunks of the 3D printed solar energy trees are wooden-based bio composites. Spiralling phyllataxy technique is utilized to design 3D printed solar energy trees.