Lumbar vertebrae, derived from the excellent BodyParts3D database. Includes L1, L2, L3, L4, and L5. Sliced in half along the mid-plane so they can be printed easily and glued together.Credit: BodyParts3D, Copyright�© The Database Center for Life Science licensed by CC Attribution-Share Alike 2.1 Japan. Interactive database and hundreds more .OBJ source files can be found here:http://lifesciencedb.jp/bp3d/?lng=en.ZIP of .OBJ files: https://docs.google.com/open?id=0B_3DyBhHQQc2X2t5ZXNpbkZqNTAJournal article describing the BodyParts3D project:http://www.ncbi.nlm.nih.gov/pubmed/18835852 http://nar.oxfordjournals.org/content/37/suppl_1/D782.full-text-lowres.pdfMy post describing methods to isolate anatomical features and get them ready to print:http://craig.bonsignore.com/2012/10/07/open-3d-human-anatomy/ (.gcode files are included for reference only -- these were for an original Ultimaker with PLA)