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Hoi Carpenoctem...
Its prints without support in the orientation of the supplied STL files.
My PLA Version was using 220°C hot_end and 70°C heated_platform.
The plunger should print ok with 0.1mm Zaxis steps (use 0.06mm if still experiencing problems)
(i.e. If the spiral thread does not form neatly then reduce your Z steps to finer detail ).....
Be sure to have the cooling fan going "Full Speed"

Mine printed at 100% speed .... you could also try reducing the speed to give the plastic a "Tad" more time to cool off during the spiral ascent.

Printing the gear part:-
.... its printed by altering the Shell thickness to 0.4mm
as it makes a 0.4mm spline that fits into the slot of the feedback potentiomenter.

If your printer fails to make the spline then you can easily slot/melt in a thin metal vane. (no worries)
Hope this helps.
Regards G.