T2 (M42x0.75) extender ring with continuous male thread.
To print these parts, I recommend a layer height of 0.12 mm or less.
Speed of external perimeters equal to or less than 40 mm/s.
Check my configuration file to have an orientation of the parameters that give a good result, without forgetting your experience.
STL available in 4 lengths: 12, 16, 20 and 24 mm.
The author marked this model as their own original creation.