I really disliked the cup holders in my 2016 Outback as my coffee cup always clanked around during my commutes so the first thing I did when I got a 3D printer was come up with and insert for the cup holder. I designed this around my nozzle, 0.40mm with (2) perimeters and (4) solid bottom layers. Printing it like that makes it somewhat flexible when printing with PETG. In any event it should print fairly fast using minimal material and will work quite well. I made the ID to accommodate my Starbucks travel cup, 71.5mm ID and beveled the upper lip so the cup will slide into the holder without fuss...

edit: for some reason the first stl I uploaded was corrupt a corrected version is now uploaded.