>>284138913
https://www.amazon.com/KIWI-design-Headband-Accessories-Comfortable/dp/B081V8W4ZQ/ref=sr_1_4?keywords=quest+headband&qid=1584239933&s=electronics&sr=1-4

This one seems to work and can be adjusted to suit your head. Not sure if it's better than the 3d printed one though.