All knobs end up in the same way: the limestone ends up clogging the nozzles and thus the knob becomes unusable. This observation gave me the idea of making a knob with an interchangeable diffuser that would be easy and quick to print (1 h 30).
The printing of the knob is the most complicated and longest (10 hours) but it is only necessary to do it once in principle.
By tightening the diffuser tightly in the knob, I did not notice any leakage at the periphery. If you have leaks, it is probably because the bottom of the head of the pommel is not perfectly flat. If this bothers you, you can always wrap a little Teflon on the thread of the diffuser.
Screwing the diffuser into the knob is difficult the first time because of the large diameter and fine pitch. I advise you to slightly oil the thread of the diffuser and then screw it in tightly. After this operation, the screwing/unscrewing can be done without forcing.
02/02/2019 - First version
PLA printing in 0.2 mm with 20% filling.
Print as oriented in the STL to have a nice screw pitch at the base. If you want to optimize time and PLA, tilt the part at 25° (see photo).
Print as oriented in the STL
4 mm edge to avoid disbonding
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