2 walls, infill(not required), supports yes. layer height 0.1mm recommended

A wavy false nail. Obviously everybodies nail sizes are different so you will need to scale the width and possibly the length in order to get a good fit. The wavy nail should be cloned in the slicer so that you have 10 nails, size each one appropriately and mirror the nails along the x axis for the opposite hand. They can be painted with regular acrylic paint or nail polish(although multiple layers may be required to get a good finish). I recommend printing these nail at a layer height of 0.1mm otherwise the layers can become quite visible on the nails. I also recommend using disposable nail adhesive tabs to stick these 3d printed nails to the nails in order to prevent damage to the 3d printed nails when they are removed.