(imma newbie) printed without scaling. The model did not fit my simple modern 40 oz metal water bottle. went back and expanded the model to 10 cm. Also cut off some of the bottom. did a rough print and now it fits my bottle. works great in the car.
Printed out of PETg and so far hasn't melted in the car even with 95 degrees this week. Had to scale it just a bit to make sure my wife's water bottle fit (it's not a name brand), and thankfully the bottom still fit in the van's cup holder. Thanks!