A year or so ago I bought the Generation Green (G2) Bottle Cutter at either Michaels or Hobby Lobby (coupons!) but here’s the tool: http://www.delphiglass.com/mosaic-supplies/tools-supplies/generation-green-g2-bottle-cutter#4 . I tried it once right after I bought it—without reading the directions :(. It worked okay, but not great. I picked it up again last week after watching a few how-to youtube videos. There are 3 or 4 of them, here’s the first one: http://www.youtube.com/watch?v=6RU5GNZAONY .
The rings on the right have no chips or breaks. The bottle bottom is pristine, too. Here’s the result of my first try. The rings on the left have chips and breaks, but are still usable, of course.
There are a couple more bottles waiting for me. I need to hold the bottle cutter tighter against the glass. I didn’t oil the cutter, either, which will probably help considerably.
I can’t see using a ring from the bottle for a bangle, but the rings will make nice jewelry once they’re cut into pieces. The pieces will have a curve to them that fits around the wrist. Then I’ll wrap them with copper tape and solder jump rings on each end. Just need to find some clear bottles. Green’s okay, but not really what I’m looking for.