This twisted ball Christmas ornament was designed by me using Blender 3-D and was inspired by this similar ornament here http://www.thingiverse.com/thing:189704.
The images were a test run that was scaled down to 80 percent of the full-size. It was printed on a PrintrBot Metal Plus using PLA. It came out quite fuzzy but could be cleaned up easily with an emery board or fingernail file.
Photo courtesy Rick Ruiz.
Updated this collection to include the bottle split in half. Suggest you print them with a brim adhesion during the early parts of the print. After printing, clear the brim of both parts and glue them together using superglue. Suggest using z-hop reverently 0.1 because the pointy sections tend to curl and can cause crashes.