Girder design for Nylon that prints

I found that when printing Nylon bridge I had alot of warping problems but I wanted to use it for printing structural items. So I had to design a girder that would successfully print without warping so that I could mix several into one design to build a frame. I've had luck with this so far. Credit goes to J Mantzel https://www.youtube.com/watch?v=YhfrHo53K18 for the idea. I've attached two different girders thickness and densities.