Bottle bearing the logo of my friend Tom Jackson, Filament Frenzy.
To make the thread print ok I dropped a counterbore into the top of the model, needs to be printed as a multiple process.
Process 1 (from the build plate till just above the base of the counterbore): 2-4 perimeters, no infill, bottom layers on, top layers off
Process 2: 2-4 perimeters, infill 15+% , top layers on
Be sure to head over to Tom's website to grab his slicer profiles or just gawp at his awesome prints!