I've described models of three types of elemental carbon, "Buckyballs", "Nanotubes", and a "Diamond Lattice Model". Graphite, the most common form of carbon, remains to be done. The Naval Research Laboratory crystal site has a very nice section on carbon http://cst-www.nrl.navy.mil/lattice/struk/carbon.html that has information about 3 forms of graphite. Coordinates of the forms are available as well as rotatable models that can be viewed with a javascript applet. The fortran program, expand_graphite.f, makes the model using simple geometry and outputs openSCAD module calls. Comment statements in the program help explain how this was done. The program is a bit of a hack; it grew longer and longer as more hexagons and atoms were added. The object was to orient the sheets to be at right angles to the build surface and make it larger than the version available from the Naval Research Laboratory, I checked the finished fortran, openSCAD version against the NRL version in netfab Studio. The two versions superimposed perfectly. Two models are provided. A sturdy model, with atoms, that prints and scales well, Graphite7_x4_2c.stl. It is the output of makegraphite7.scad scaled up by a factor of 4 and with two added rings (outer diameter 44 mm, hole 30 mm, thickness 2 mm).Graphite11_x4_2c.stl is a more open model without atoms, that shows only the hexagonal lattice. The shift between the hexagonal layers can clearly be seen.Graphite7_x4_2c.stl is about 45 by 45 by 55 mm in size. It takes about an hour and a half to print with a raft. Scaled down versions print well. The picture with multiple models shows a range of sizes; the brown model in the middle foreground is Graphite7_x4_2c.stl.The open model, Graphite11_x4_2c.stl, prints in just over an hour. It is shown in the picture containing a single model. Caution a bit fragile.