I used a 0.20 mm nozzle. You may be able to use a 0.40 nozzle. I dunno. I never tried.
I sliced the switch_base with 0.10mm layer heights, with the bottom up. It is just barely large enough to not need a brim on my printer.
I have to include a brim when printing the tiny switch_top, which I printed at 0.05mm layer height.