The adapter ring will NOT fit when printed separately (there are intended overlaps / the ring is too big alone). Load the main model ("pixel-watch-charger.stl") first - do not move the model! Then right-click it and select “Add part” then “Load..” and choose the "inner-adapter-ring".stl". Now you can move the model as requried.
After printing, the original charger cable should snap-fit in, depending on your printer's tolerances.
Print with the charger-slot on the print plate for easy support removal.
edit1: added missing base plate.
The author remixed this model.
Added an inner ring adapter that needs to be added after loading the original model (pixel-watch-charger) as a “part” in PrusaSlicer.