Organic Chemistry Stencil (University Level)

Model Overview & Print Notes

The Organic Chemistry Stencils that I was able to find on 3d printing websites all had some issues when trying to use them. Either the Newman projection angles were not 45' into the plane, or the Chair Conformation angles were incorrect, or the equatorial & axial and other bond angles were misaligned, or the sides of each “-ane” were all different lengths, which prevented drawing compounds such as Bicyclo 1,6-nonane/decane without projections, etc. Another issue was that when using pencil or pen, the templates were not able to compensate for the width, ending up with misaligned drawings. This template is directly printable from the .step files for both a standard 0.7mm pencil width, and for a 1.2mm pen width.  The template contains the following constructions: Circle for base of Newman projection Cyclopropane C3H6 Cyclobutene C4H8 Cyclopentane C5H10 Cyclohexane C6H12 Cycloheptane C7H14 Cyclooctane C8H16 Alignment for rear lines of Newman projection Alignment for forward lines of Newman projection Cyclopentane on a 45' projection into the plane Chair Conformation of Cyclohexane Bicyclo 1,6-nonane at a 45' projection into the plane Fisher projection Equatorial and axial bond lines for chair conformation - rotate for the other side of the molecule Single, Double, and Triple bond lines. Dashed Wedge Solid Wedge Cyclohexane on a 45' projection into the plane Boat conformation of cyclohexane Bicyclo 1,6-decane on a 45' projection into the plane Carbon chain with optional double bonds NOTE: Each outline has been compensated for either the diameter of a pencil (0.7 mm lead) or pen (1.2mm ball) for all interior angles. This ensures that all shapes when drawn will have the same side length (10 mm for pencil, 9 mm for pen), except for the Boat and Chair Conformations which will have a 15 mm side length. These sizes were chosen so that both stencils can be printed on a Prusa Mini (less than 18cm total width). The widths of each (Pencil and Pen) were determined by testing the amount of “squish” in the first layer(s) and ensuring that the widths were exact for each. The stencils were printed on a Prusa Mini using a 0.6mm steel nozzle in Transparent PETG with no infill layers (solid). This was for ease of use as an overlay and for overall stencil strength, but they may be easily printed using a 0.4mm nozzle, or in any material available as-is, without any issues or changes required. --- If you want to modify (or remix) the stencil template, I've included the FreeCAD files for both the Pencil and Pen stencils. The only differences from the Pencil to the Pen stencils are the number of lines used in the Dashed Wedge, and minor layout differences. If you need to change the stencil widths or want a larger version* of the stencil, the included FreeCAD sketches have calculations specified for automatic compensation of all interior angles due to the width of the drawing utensil. This also dynamically recalculates all of the shapes and projections as specified in the layout. * i.e. Change Length to 15mm to enlarge the stencil by 1.5x but still keep the same pencil width compensation! For the Pencil sketch, the following 3 key constraints are easily changed: 1.2 mm - Nozzle Width ("gap" - i.e. 2 x 0.6mm or 3 x 0.4mm for strength) 1.5 mm - Pencil Width ("draw" - i.e. 2 x 0.7mm lead width) 10 mm - Length ("size" - feature/side length for every element in the stencil) For the Pen sketch, the following 3 key constraints are easily changed: 1.2 mm - Nozzle Width ("gap" - i.e. 2 x 0.6mm or 3 x 0.4mm for strength) 2.4 mm - Pen Width ("draw" - i.e. 2 x 1.2mm ball nib width) 9 mm - Length ("size" - feature/side length for every element in the stencil) --- If you find this stencil useful that's fantastic - give it a “star” to help others find it too. If you find something in error, please let me know and I'll try to correct it. If there's something missing, remixes are welcome and I'd be keen to see your enhancements. Attribution is appreciated but not required. 

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