the design is not perfect, but I have not seen anything better in thingiverse at the moment and more and more people have this device.
I recommend improming on TPU or filaflex.
I also recommend that you scale it to 99.5% if you want it a bit more adjusted to the device since the design is not perfect.
The layer height is better than 0.2mm and a 40% fill is what I have used, and it is important to use supports to use TPU
rescale according to tastes 99.1-100% in cura