Reddit reviews Glass Bottle Cutter Kit - Glass Cutter for Beer Bottles - Wine Bottle Cutting Tool to Cut Wine Glasses from Wine Bottles - Ephrems Deluxe Bottle Cutter Tool with Extreme Size Attachment and Adaptor
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ADJUSTABLE LENGTH - The new Front-Back Extender allows cutting glass bottles as close to the bottom as possible. This glass cutting machine can also cut very long bottles, even those with vertical sides that are more than 7 inchesCUTS AT DIFFERENT ANGLES - This bottle wine cutter features an adaptor that allows to cut on all portions of the necks and non-vertical surfaces of the bottle. The powerful blades score the bottle well for smooth edgesCUTS ANY SHAPE BOTTLES - The Extreme Size Attachment included in this glass bottle cutter tool kit cuts any shape and size of vodka, wine and beer bottles (square, hexagon or round), glass jars and glass tubes (1” in diameter)EASY TO USE - Recycle wine and beer glass bottles with this complete wine bottle cutter kit, which includes the cutting tool, extreme size attachment, front-back extender, adapter, grit paper and instruction sheetsHIGH QUALITY AND ECONOMICAL - Cut wine bottles and other glass bottles and jars with Ephrem’s durable glass bottle cutter cutting tool. This glass scoring tool is cheaper yet powerful than other bottle cutters to make glasses
The wet saw takes a lot of time and practice, and unless you have a disc sander, and lot of work on your hands to get smooth tops because there will be rough edges. The method I currently use is just score with Ephrem's bottle cutter, and then I use hot water from a kettle and cold water from the sink to stress the glass. I get perfect breaks over 95% of the time. It took a while to get there, though. I have a kettle where I can set the temperature. For thinner wine bottles, 170 degrees. For Doms (yes, I cut a ton of those), you want a little bit hotter, 180. But don't stress the glass too much, otherwise it won't break cleanly. That was my biggest problem first starting out, I used water just off a boil and it was stressing the glass out too much, and it wouldn't break at the score. Also, diamond embeded sanding pads. I get mine from HisGlassWorks. Get the velcro pads. Expensive, but worth it, they have saved me so much time wet sanding the tops.
Using the hot and cold water does take time, time to heat up the water. With one kettle of water, I can cut 3-4 bottles. So it is a lot slower than your method. But I usually have other things going while I am cutting, like wax melting. And the sanding takes time too. I'll sand the batch I just cut while I wait for the water to heat up.
I am curious to know what your method is.