Just finished printing the parts, one by one on the orientation shown. No brims, no rafts and no supports. Next step: sanding and painting.
I sanded and/or primed almost everything (the exception was the neck) and then painted it all. I got a vial that would fit and atached its cap inside the body so that one can screw/unscrew it to add/remove liquid.
Just noticed I assembled the nozzle and the buttons the wrong way!!! H**l now I will leave it that way and reprint the head/nozzle and buttons some other time...