This is a stand to hold a kindle K3 attached to a lamp stand. I use it to read sitting on an exercise ball or a straight backed chair. This helps with neck pain that is worse when bending forward or looking down. It could also be used while riding an exercise bike or standing.

It's called a Nook Hook Book after the character in the Dr. Seuss book "One fish, two fish, red fish, blue fish"

We saw a Nook.
On his head
he had a hook,
On his hook
he had a book.
On his book
was "How to Cook."

It would be an even better name if I had a Barnes and Noble Nook instead of a Kindle!

The brackets are sized for a short horizontal pipe or rod ~16 mm diameter, and a similar long vertical rod. On mine the vertical rod is part of a lamp stand I already had.

You'll also need:
4 of 4 by 45 mm bolts
4 of 4 by 20 mm bolts
8 nuts

Print two kindle brackets, a post bracket and a post clamp. The clamps have holes for trapped nuts.