Summary

This book page spreader is designed with a very soft bevel on all sides, an enlarged thumb hole, and is extra wide. While technically not a "remix," I totally copied the design from this product I found on Amazon (see last image). My improvements were to enlarge the thumb hole and make it extra wide. This should truly make it a pretty one-size-fits-all-hands-and-all-books print. No supports or brim needed.

The curved side is recommended for paperbacks and the flat side for hardbacks. But this makes little difference in reality; choose your own adventure!