Bolt which you can size clicking on the scale button of your printer software. These screws can be very useful and make whatever your screwing seem more alive.
Print vertically with the screw head backed on the printing plate. Be careful while you are removing the support material, it could be fragile, so if you print a small screw print it with the highest infill to be sure that it will be resistant. You can print with 0.25 resolution.