I generated some snowflakes with snowflaker from Misha Heesakkers (https://www.misha.studio/snowflaker/) and turned them into printable models. 

Feel free to change the sizes or create your own individual flakes with the tool.

Mine are printed with glow-in-the-dark petg filament, therefore I used a 1.2 mm thickness and a 0.4 mm nozzle.