This one is made from some leftover 3/4" melamine that I still have stacks of lying around my shop. This one is similar in design to the first jig but there are a few small improvements. First, I made this one so that it extends past the blade, which makes it easier to clamp to the saw without the clamps getting in the way of the workpiece. Of course, this meant cutting a slot halfway into the jig so that it can be slipped around the blade. I actually made that cut at the table saw (since that blade is wider than the band saw blade) so that the blade has a little extra room to move within.
Also, the bolt that I used for this jig (as the center for the circular workpiece) is a 3" eyebolt. It is held in place by one hex nut on top (which, just like in the previous jig, sits in a dado so that it is flush with the top of the jig) and a washer and two hex nuts on the bottom. I can easily adjust the height of the bolt protruding through the top of the jig. And, the loop of the eyebolt makes loosening and tightening the bolt much easier (no screwdrivers!!). Now repositioning the bolt along the jig is much easier and can be done with one hand and no tools.
Dan and I used this jig to cut two 24" circles out of 3/4" poplar and the jig worked great! And this jig is so much bigger: the slot actually extends to 34". So I can now cut circles up to 68" in diameter!! I can't imagine what I would need them for... but it's nice to know that I could do it if I wanted to.