I made the mistake of cleaning with boiling water the original button so I modeled this one as a replacement.
You can find the original thermos here (or in may other places, it's often rebranded): https://www.amazon.it/dp/B09SZL233P/
Remember to print with you strongest settings and with food safe filament (PLA or PETG).
With my prusa mini i used 0.15 layer height, no supports, 100% infill.
You'll probably need to sand it and clean off the model after printing.
Fit is pretty thigh, when mounting be very careful.
The author marked this model as their own original creation.