On the Bottom of the Cup, there is a hole (diameter 21.5 mm), this is for the USB Connector, it's Not Mandatory but is a great feature if your car have the cup holder in the right position.
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The Magnet Circle
If you buy the suggested magnet circle, you can use it as is (with the tape) or remove the tape and frame it in the cup holder cover.
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The Best Filaments
For automotive supplies, ABS is the best choice, but in my opinion, PETG is enough, maybe depends where you live.
Bambulab PETG-CF and ABS-GF have the best finish.
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Video Instructions are better than Written Instructions.
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