The REI Flex-Lite camp chair (https://www.rei.com/product/877258/rei-co-op-flexlite-chair) is excellent, but with a few drawbacks:
-A bit unstable.
-The pointy feet sink into soft ground.
The feet in this model are intended to increase stability by widening the "wheelbase", and prevent you from sinking into the ground by increasing the surface area in contact with the ground. Go out and buy your own cupholder, or just hold your beer, princess.
Print 4x of these, with relatively dense infill (~25%), at least for the bottom 10mm or so. I recommend PETG, but PLA can work (you may have to use a heat gun to soften the piece while attaching to the chair). If using PETG, the feet should just snap on with a little force.
Amazon Basics PETG preferred
PETG is a great option, because it'll need to be tough & flexible, and you'll probably leave this in a hot car. PLA won't stand up in a hot car.