Snap fit enclosures, where small tabs bend out of the way and snap into a channel once a lid is fully pressed in place, are a beautiful opportunity to utilize PETG. With PETG you can also take that ductility and use it in the design of some purposefully flexible geometry. It's the different of printing a PETG shelf bracket that's starting to droop and a PLA shelf bracket that dumps your books onto your desk and monitors. In contrast, PETG will bend a little before it breaks, so you can see a failure before it happens. Where PLA may be able to withstand more force without breaking, when it hits the threshold where it'll break it is very sudden and without warning.
If you're used to printing with PLA, then you might not have considered a unique attribute of PETG: that it's ductile. In terms of print settings, across all these variants they will be approximately the same, with some minor tweaks here and there to reduce stringing or improve layer adhesion.
This can make it seem like these are many different filaments when in reality they are just slight variations in the formula to create a material that is more translucent, stronger, or more flexible. You’ll often see references to PETG in one of the following forms: PET, PETG, PETT, and many others. In a sense, it combines the most useful characteristics of ABS with the ease of printing (and color availability) of PLA.
When used as a 3D printing filament, PETG has found its home as the more accessible "durable 3D printing filament" due to its relatively stable 3D printing properties that make it easy to print and yet capable of being in low-heat or high-strength environments. Basically any clear plastic bottle is going to be made of PET (Polyethylene Terephthalate) or PETG (Polyethylene Terephthalate with a glycol modifier) and in fact many consumer 3D printers utilize PETG or some derivative to makeup their 3D printed structural components. PETG is an extremely common polymers used today that you likely encounter without even realizing it.
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