Most Tri-Bahtinov masks available for sale are 3D printed in PETG filament. This is a really great material that is perfectly acceptable for most applications, but Tri-Bahtinov masks tend to be relatively thin and when stored in cars during hot summer days (or in other very hot conditions) they can warp - ruining the mask.
In our constant quest to improve quality and make the very best products we can, we are delighted to announce that all of our Tri-Bahtinov masks are now printed in super heat-resistant ASA (unless explicitly noted otherwise). These masks should be able to resist absolutely any heat you can throw at them. We've tested them in the extreme heat of the Mojave Desert.
We're also pleased to say that we offer these at no additional cost over what PETG masks sell for. Check them out and get yours today! If you need one and we don't make it, reach out! If we can we will be happy to accommodate.