Butterfly
thingiverse
It's basically just a twisted cube shape that prints out smoothly, without needing any extra support. I've added a central ball feature to reduce the likelihood of it cracking apart during the printing process, typically around three-quarters of the way through the job.
Download Model from thingiverse
With this file you will be able to print Butterfly with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Butterfly.