1,1,1,2-Tetrafluoroethane, commonly known as HFC-134a or Freon 134a, was developed as a primary replacement for the ozone-depleting Freon-12 (CFC-12). It became the standard refrigerant in automobile air conditioning systems and household refrigerators throughout the 1990s and 2000s. Unlike its predecessor, it contains no chlorine and therefore does not deplete the stratospheric ozone layer. However, HFC-134a is a potent greenhouse gas, with a global warming potential over 1,400 times that of carbon dioxide. Consequently, it is being phased out in many applications in favor of newer refrigerants with lower global warming potential, such as HFO-1234yf.

Explore searchable catalogue of hundreds of molecules, including details on how models were generated.

Notes

• If you happen to break something, use superglue to fix it. It will make the broken part even stronger.
• I decided to go with the ball-and-stick type, as it is easiest to color, is rigid, and looks awesome.
• The model represents the major resonance contributor.
• I oriented the model for optimal strength/waste/time compromise, but if you decide to reorient it, try to avoid placing bonds along the Z-axis, as they will be very easy to break.
• Supports removable without too much worry of damaging model if you are careful with scalpel and do of paper-sanding afterwards.
• You can use PETG as support material (don't forget to set the heatbed to 70 °C!) and PLA for the model itself (the support then come off much easier). For extra swag, use PLA support filament or PVA as supports.
• Recommended colorization is based on the Corey–Pauling–Koltun (CPK) palette (Figure 1). To quickly change colors, use the settings depicted in Figure 2.
  Alternatively, if you want to save filament and time, print the model in full-white and paint it with a permanent marker.

Figure 1. Recommended palette based on CPK coloring.

Figure 2. Setting to quickly color atoms with one click.

Happy printing!