Very interesting blog. Alot of blogs I see these days don't really provide anything that I'm interested in, but I'm most definately interested in this one. Just thought that I would post and let you know. custom invoice books
Just updated it!
Why didn't you share the URL to sign up in the article
Take a look at a free archive by Andrew Alex with tileable 2K PBR textures which you can use for your commercial and personal projects.
The folder is a part of his material study which he worked on in his free time. Alex mixed Zbrush and Substance Designer to build these textures.
Find him on Artstation to look at his other substance experiments.