I've made several also, always with the points. The author recommends using the points, but if you're happy with the way you're doing it that's all that counts.

For my first OBW I cut off the points, and boy, was I sorry I did. They just don't line up as well. The author is pretty clear on this. Without the points, you have to constantly turn the fabric back and forth to see if it's lined up correctly. It's SO much easier with the points if you've never done one before.

I don't use that kind of ruler, I use a 6x12 inch one, and place the 60 degree line along the straight of grain (or cut edge) and make the 60 degree cut. But I have the same piece of fabric and just love it. Would like to see your finished project.

I like the ruler with the flat point for cutting. It eliminates excess fabric at the center point of the hexagon and makes sewing and pressng easier for me. Just my opinion.

! would use some scraps make up your size you have and cut it, see what you get.

The size of your triangles really doesn't matter as long as they are ALL THE SAME SIZE ........... ask me how I know this.

Use the measurement down the center of the ruler not the edges. The little round dots. Thecsides are for doing pyramids.

kraftykimberly is correct on the pointed ruler. I took an OBW class a couple of weeks ago. A lot of us had the ruler with the cut off point. We had to replace them as it did not work very well. Clear View is the ruler we got.

This is exactly why the author strongly recommends the Clearview 6" 60deg triangle as part of the equipment required to make One Block Wonders - it has the point, and there will be no problem.
Apart from cutting accurately, you will match up seams far better with the points.
This is listed in all three of the One Block Wonder books.

Didn't read all the posts, so hope this isn't a repeat. Take a normal ruler and measure from the narrow end of you ruler to the 3 1/4 mark, I am betting that says 3 3/4. The 3 1/4 is after being sewed size I am thinking. Could be wrong.