Pretty impressed how well that one turned out. Used SUNLU TPU in yellow with 200/50 degrees Celsius at 20mm/s speed on my Voxelab Aquila (upgraded PEI bed and DirectDrive, also used Filament drybox).
This filament to be exact:
Angebot: SUNLU TPU Filament, 1KG Flexibles 95A TPU 3D Drucker Filament 1.75mm Maßgenauigkeit +/- 0.03 mm, Hohe Liquidität und Elastizität, 1KG（2.2Lbs) Spule, TPU Filament für FDM 3D Drucker,TPU Gelb https://amzn.eu/d/7H5TLjr
That always depends on your needs. If I don’t need something right now, I don‘t print it. I had some months i didn’t print at all, because I just had no need for 3D printed parts.
If you want some ideas on what you might need, i suggest going to printables and simply type in TPU.
For me there right now are some small parts I already need to print:
https://www.printables.com/de/model/231981-soft-tpu-vise-jaws
https://www.printables.com/de/model/294397-flexible-tpu-work-mat
https://www.printables.com/de/model/207308-tpu-zippo-gasket
https://www.printables.com/de/model/124743-tpu-flex-cable-zip-tie
And some parts I am currently designing myself for inside an old iPod i am currently upgrading to micro so card