A method for high resolution projection micro stereolithography for 3-D printing comprising: generating a 3D digital model of the sample to be printed in a computer, slicing the digital model into a sequence of images, wherein each of the images of the sequence represents a layer of the 3D digital model, positioning a transparent printing head relative to a resin vat containing a photo-sensitive resin, moving the transparent printing head into position for selectively exposing the photosensitive resin, sending an image from the sequence of images to a LCD or DLP chip, and together with a light source projecting the image through a lens onto the flat tip of the transparent printing head to initiate cure of the photosensitive resin in areas where the projected image allows light from the light source to reach the photosensitive resin.