I wanted to make a modular paper tray and organizer, so I can grow it the way I need. Due to my printer printing area the paper is actually doesn´t fit completely, but I even like it (it easier to take the sheets).
There are three different trays: top tray (with curved edges) inner trays and the tray for 3 boxes.
There are also three different boxes: one for general purpose, another for pens, clips and coins, and the third for visit cards.
The bottom is solid, but I used a 15% honeycomb infill in Slic3r (0.3mm layer height).
Hope you will like it
Just added PAPER TRAY and TOP TRAY large enough to fit letter size paper (8.5in depth). It´s still compatible with the rest of parts.