Summary Molecule structure STL files are generated by OpenSCAD, of which program is generated by "sdf2scad.perl" Perl script from NCBI PubChem database (3D SDF format files). About generating scripts and note, see http://www.thingiverse.com/thing:689652 (Water and Ethanol). Bad health for your 3D printer!! Nicotine (C10H14N2) causes many diseases and reduces the health blah blah blah... Construction 3D data (SDF file) is from the PubChem Project https://pubchem.ncbi.nlm.nih.gov/ . Instructions See http://www.thingiverse.com/thing:689652 (Water and Ethanol) for detail.