My wife picked up a package of these at the store today and they wanted $8.00 for a pack of 4. I told her no way - I can print one of those for you. She agreed and I saved $8.00.After modeling it for the photo she continued to wear it for several hours and even forgot it was there. Success! Print (1 extra shell and 25% infill worked nice for me). Place straps behind the ring and loop around.