As a woodworker I hate butt joints, so when I tried making these slab style vases I wanted to use 45° miter joints. After making the tall squarish vase on the left I thought there had to be a better way to cut the joints rather than an xacto knife. So I came up with a new tool.
I took a short strip of 1/2″ plywood and used my miter saw to cut a 45° angle on one end. Then attached a scrap of 3/4″ pine with some 1″ staples at a position that would allow the razor blade to scrape along the top of our work table. The razor blade is one that is perforated so you can snap off the tip. It had a hole already in it. I had to use the nut and washer as a spacer so the shortest screw I had wouldn’t poke out the other side.
You just place your clay slab on along the edge of the table and slide the tool towards you holding it firmly against the bottom and side of the table. You can loosen the screw and turn the blade down while not in use.