That's really cool that you were able to print your own tools to help you with some difficulties. Apparently more people are struggling with these things so well done on the downloads!

I currently have Carpal Tunnel syndrome and looking at the book holder makes my thumb hurt already, lol. But that's because these temporary symptoms are making pressure with one finger really hard, it will go numb quickly. I can see how it would be helpful normally though!

Keep up the good work of designing them, maybe patent them?