Print the dividers and rod first, you'll need these for the next step. 
Printing the box, you will need to decide when to stop your printer to drop the rod and dividers in the opening. 
--------Be sure not to do this to early because your printer head will hit it in passing. -------
Notice there is a flatter side to the rod that can face up to HELP avoid hitting the printer head.
Print the box and drawler the rest of the way. 
The round disc is for the drawler to make the spot to open the drawler less a eye sore. I glue this on after because mine didnt fit right after printing it together the first time. 
Print two sets of cubes. place them and glue together.

Here's a thought glue on magnets sheets to the sides and photos, so that you can change out the photoes whenever it strikes you. Also would make a great date display!