I am getting started in 3d printing, and I only have a small 6in bed to work with. I wanted to try out a speed square, but all the files I could find ready to print were 6in or more, and wouldn't fit on my bed. So this is basically my first designed from scratch item, which was good practice for learning basic Blender. 

I had good results printing at the slowest speed possible, at the smallest layer height I could manage (.1mm). Since this is for accurate measurements, I'd rather it take 12 hours to print perfectly than 3 hours to print illegible and inaccurate.