Pictured is my Kobo Clara 2e with a laser cut leather cover hand stitched to the 3D Printed Parts and replaceable arms. So far I have the Kobo Clara 2e, Kobo Nia and the Kobo Clara HD designed. I’ve also made the parts available on
Thingiverse: https://www.thingiverse.com/thing:6340022
Printables: https://www.printables.com/model/662929
and the FreeCAD design files are on GitHub: https://github.com/the16bitgamer/16BitVirtualStudiosDesigns/tree/main/GLoA E-Reader Cases/6 inch
I thought the same too, that is why the arms are not the same color as the plastics, they are removable. Meaning when they break they can be replaced.
I’ve made arms out of both PETG and PLA, and while yes they broke, with the help of my SO, I refined the design so that they don’t break. Our longest lasting arms thus far is between 4-6 months. It’s taken a lot of refinement and subtle fillets and cuts to the model, but the arms hold up well, and the goal is for them to be better than a cheap case you get from Amazon, which I find breaks within 6 months to 1 year.
While I think TUP would be an ideal material for this, so far with the adjustments I’ve made to the e-reader arms they’ve been both reliable and if you are kind to your devices, will hold up well, with the worse case that you can reprint them if they do break.