Pick the two ends, set the fit and shape, and check the preview. Every part is printed upright, larger end on the bed. Matt reviews every request before anything is printed.
Ends
Fit (per end)
Shape
Knurl only goes on straight cosmetic runs, never on spigot fit faces, lead-ins or bores. Its ends are 45° chamfers. Knurled bands are marked no-fuzzy-skin.
Display
Result
adapter mating hose/port (ghost) fuzzy skin OK mating, keep smooth knurled fuzzy texture: visual preview only