Every now and then when cleaning the faucet this plastic ring can get damaged when removing the HANSA cartridge. This recently happened to me, so I decided to try and create one and the results were good! Check the gallery images and video on Youtube for visual representation.

Printed with:

100% infill
0.15mm layer height
PETG filament

I made 8 prints before I got my dimensions right - for it to be inserted easily and removed as well (check video for that).

If it does not fit, try scaling it. I attached also an image of dimensions if you would need to draw one yourself. Reach out in comments for any help, I will try to respond fast.

Youtube: https://youtu.be/4_HBFV41p4k