This is a remix of my first bookstand, but this now has a hinge so it fits better in your backpack or whatever you carry it in. I have not yet printed this as it is in the middle of summer, but please tell me if there is something wrong or something to be improved.
I have split the part for better printing, but I also included un-split parts if you want to do it yourself. Considering I haven't printed it, there is probably a better way to cut and/or orient it.
I found some nice pins for the hinge on amazon here: amazon.com/gp/product/B0728JBB66/