These original end caps have a very limited longevity... so i designed a replacement.
Sadly 3D prints along layer lines like this one are not any better but at least i can make them anytime.
Made to fit Siko Thermostatic bath faucet pro S-line model SIKOBSLPRO222T
As many manufactures use almost the same shape and end cap on their thermostatic faucets there is a solid chance it will fit other types too or with just a small modification.
The author marked this model as their own original creation.