Spare spring for an EM77 thermos

thingiverse

This is probably best printed using PETG or ABS filament to guarantee longevity and springyness. I had none to I stuck with PLA and that seems to work just fine and has enough tension to press the glass interior into the rubber ring connecting to the spout. Considered the original spare part on the internet too pricy. Also it does not seem to be around in stainless steel anymore. So why not print it.