Voronoi Easter bunny fixed with opening

Update V5: I finally managed to make my own bunny. Based on the Standard bunny in meshmixer. I've straightened the ears so it prints easier, created the mesh and implemented the same lock as in V3. If printed at full size the inner diameter of the opening is about 30 mm, so you can put some nice things in ;-)
Also this bunny should be possible to size down up to aprx. 50%, at least on my printer.

Advantage in my eyes:
- prints a bit faster
- thicker structure allows sizing down
- large op