This is a custom model desk organizer. There is a set orientation, however, anybody can easily make any orientation cups and slots. Each model attaches in the back with five #6-32 screws. I use the Left side for pens and pencils, the middle has quick access to 9 writing utensils and 2 deep cups. The right is used for tools.
If you want to edit this model, go to Onshape.com and search Modular Desk Organizer