This is an import and model fix from https://www.thingiverse.com/thing:4677101.
I just printed it for my radiator and my Moes radiator thermostat.
Material: PETG / ABS (PLA might be too hard, it should bend a little)
Print orientation: I printed it as is, but it might be easier upside down!
Layer height: 0.2 is good
Infill: 20%
Supports: with supports, you might want to forbid supports on the thread.
The author hasn't provided the model origin yet.