Water and Ethanol - OpenSCAD generated from chemical SDF files

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Molecule Structure STL Files Are Generated by OpenSCAD, a Program Created from the NCBI PubChem Database's SDF Format Files Using the sdf2scad.perl Perl Script. Model Generator Perl Scripts and OpenSCAD Subroutines Are Also Included to Allow Users to Generate Their Own Chemical Files from SDF Data or Tune Model Parameters. To Do This, You Will Need Perl and OpenSCAD Installed on Your Computer. The Most Basic Molecules Available Are Water (H2O) and Ethanol (C2H5OH), but More Complex Models Can Be Uploaded for Use in 3D Printing. February 22, 2015: Updates Were Made to the sdf2scad.scad and sdf2scad.perl Scripts. See Instructions for a Full History of Changes. On Ethanol, I Included Separate STL Files for Dual-Extruder Printers, but This Can Cause Contamination Issues. However, the Script Is Still Capable of Generating These Files. See Instructions for More Information. For 3D Printing, Scaling Up Molecules by at Least Eight Times Is Recommended to Ensure Strength and Accurate Chemical Composition. If You Plan on Creating Other Chemical Models, Applying the Same Scale Will Also Help Ensure Accuracy. You Can Obtain Free SDF Data for Your Favorite Chemical Materials from PubChem and Convert It into OpenSCAD Format Files Using the sdf2scad.perl Script. From There, You Can Run OpenSCAD to Generate STL Files for 3D Printing. See the Perl Script for Limitations and Instructions on How to Use It. Some CAD/Slicer Software May Require Models to Be Fixed Before They Can Be Used. If You Plan on Creating Larger Models for Chemical Students, You Can Increase the $fn Value or Define $fs in the sdf2scad.scad Script. To Make Painting Easier, I Separated the Model into Carbon (Black Filament) and Non-Carbon (White Filament with Paint) Parts for Dual-Extruder 3D Printers. However, Contamination Can Still Occur. If You Need to Generate Separate Files Like This, Set "$isc = 0;" to Generate the Non-Carbon Part, Then Set "$isc = 1; $isxc = 0" to Generate the Carbon Part, and Run OpenSCAD Twice for Each File. February 22, 2015: Updates Were Made to the sdf2scad.scad Script to Fix "Non-Manifoldness" Errors with My Slicer. February 22, 2015: Updates Were Also Made to the sdf2scad.perl Script to Support Triple Hydrogen Bonds. February 21, 2015: The sdf2scad.scad Script Was Updated to Include S Atoms.