This is a remix of "Book Stand" by nyptus on Thingiverse. I simply added thickness and a little extra width to make them sturdier and compatible with Read-Along chapter books using his original STEP files. 

The cool surface texture is the "Cubic Infill" pattern at 25% with exposed top and bottom layers and five perimeters, sliced in PolyPrinter's version of Cura. The attached zip folder contains G-Code files only compatible with the PolyPrinter 229 printer to print these stands in this exact style, and should be ignored and re-sliced for other 3D printers. The modified STEP files have also been included for further modification.