Designed this headband as i keep stepping on mine and breaking them. Now i have an endless supply :>

I recommend printing this at 95% scale, so it fits like the ones you can buy.
No supports are needed, as i included custom sticking points in the model, which will disconnect easily after printing.

I printed it with PETG and 90% infill, as PETG will not stretch as much over time as PLA. PLA should work too though. Stiffness obviously differs between different PETG brands.