Once you have removed your ornament you then can began to remove the fine hairs with a lighter or hot knife. Be sure and move quickly so as not to melt the plastic ornament you're working on. Most of the ornaments that I create are shaped similar to a half finished death Star. If you wish to create a full sphere, you need to create two halves and then weld them together after you have removed them from the tennis ball form. One trick I use is to create the ornament using the lines on the tennis ball, rather than a straight half circle. This also helps hide any seem that is created when I weld the two halves together, as it is not a straight line.
So here we have our finished ornament and all that is left to do is to add a bit of thread or ribbon to hang it by. We can also add lace, beads, crystals or other decorations to the ornament as well as sand and paint the ornament as needed. The type of artwork you use is up to you and I have personally created ornaments for all the seasons, not just Christmas. So have fun and enjoy creating a little bit of artwork with your 3-D pen.