TMA 1 headband you can print if the old one snapped.
See the rest of the info on this thing page for instructions.
Printed for the Endless Objects project. www.endlessobjects.com
If you use Slic3r you can create a modifier model and only make the middle part of the headband 100% infill and then gradually less towards the ends to save on material and weight. Probably doesn't do much in terms of printing time but it's a suggestion.
The TMA 1 has been infamous for its headband snapping. AIAIAI has been a champ to respond to this issue https://www.facebook.com/aiaiaibook/posts/10152697316829158 and their TMA 2 is a big improvement.
However, if you still have your old TMA 1 parts lying around like I did, it's a shame not to put a 200-250 euro headband to use.
Replacing the headband
The earcups have a little metal balls that snaps into the holes of the headband. Use a potatoe knife or something similar to press it in and be able to remove the headband.
This part doesn't have any solution to attach the loose hanging wire from the earcups. Best is to use the old rubber part and glue it back on to the printed part.
Otherwise, feel free to make a re-design.
Also, if it snaps again, feel free to redesign it and make it thicker, or use a stronger material to print with.