I made a water droplet desk toy. When you crank the handle on the side, the top moves in a wave-like pattern, imitating a droplet landing in water. I was inspired by this. Here is a gif of it moving from the side and here's one from the top.
Update 9/27/17 5:00 PM: Fixed center droplet to be scaled properly to the rest of the model.
Update 9/22/17 11:30 AM: Added STEP file containing all pieces for easier modifications.
Update 9/19/17 2:15 PM: Added "Top Strip" and "Middle Strip." This will allow for a quicker print time and a different overall style.
Monoprice Maker Select Plus
Print one of each of these: base, cap, center, handle, middle or middle strip, rings, shaft, spacer, and top or top strip.
The only piece you absolutely need support for is the shaft. Everything else is up to your discretion but really isn't necessary. For the center droplet, you can print it either on its side or vertically, but I recommend on its side with support on to decrease the chance that it would fall over during printing. On some printers, the gap between the moving rings and the base plates may be too tight, in that case try making the rings at 98-99% size, or you could just use a file on the edges of the holes in the base plates.
Start by placing the shaft in the holes of the base. You should be able to slightly flex the base to squeeze it in there. Next You can put the middle base plate, then the top base plate. Now you can add the rings through the base plates. If they aren't free-moving try to file the holes to be a little bit wider. Finally use a little super glue and place the cap on one end of the shaft and the spacer and handle on the other side of the shaft, making sure that the rings and the shaft are aligned properly.