This is a Page Stand, also known as a Document Holder, used to hold papers upright for transcribing them, or reading them as notes. 

This is based off a design I had when I was in High School, and while I can't include the neat water-effects it had inside, this one does have a flat face in case you want to add a logo, text, or the like to the front. 

I've included an angled variant for AMS/MMU multicolor prints, to reduce the number of filament changes, but this does include some steep overhangs. My P1S can handle it, but if you don't have sufficient cooling your printer may struggle. 

You're welcome to remix, but please link back to my page. 

I highly recommend printing with a lot of walls or infill to give it some weight.