My office is relatively dark. The solar panels for the keyboard rarely get enough light. When not in use, I store them on this vertical stand toward the window where they can get 500+ lumens. The keyboard sits upside down, covering the Logitech Logo but leaving the solar panels free. But storing them here once a week, they can remain fully charged.I printed with ABS, using a 10% fill. The half circle in the back aids in stability.