Easter eggs with wavy design. You get 3 stl files. They are easy to print since retraction is not needed. Each layer (except for initial one) is one perimeter, therefore the printer head just goes round and round, starting next layer at the same point where it finished the last one. You can also use vase mode.

3D printing settings

Nozzle: 0.4
Line width: 0.35
Layer height: 0.32
Perimeter (wall line count): 1
Infill: 0%
Bottom layers: 1
Top layers: 0

Printable in vase / spiralized mode