Christmas spiral ball ornament

thingiverse

When the chistmas ornament spins, there is a small optical illusion that make it seem like the one screw goes up, while the other goes down. The size is around 40mm, and it should be possible to print it in less than an hour. A perfect little extra present for a cold and cloudy winter day. It can easily be printed in place, without support, if you do not scale it. The underside may be a little ugly though, due to a heavy overhang. If you plan to hang it up high, it may be best to print in the opposite way. Using a brim of 30 lines, seems to be perfect for this print. Have fun! https://youtu.be/SA5NyRmyCEw