Rotating Desk Organizer

This is a rotating desk organizer I designed for the Student Virtual Prototyping Design Challenge.
I put a lot of hard work into this desk organizer, as I'm sure everyone else in this challenge is.
Along the way I came across many challenges, a very significant challenge that I encountered was creating the various pen holders that line the sort of spire. I ended up using Blender's array modifier in order to create several symmetrical versions of the same object which lined the spire. There isn't much I would do to redesign my desk organizer other than finding a way to better support the pen holders. I worry that they may fall apart during printing, and as I cannot simulate real life 3d printing physics in any engine (that I know of) I have no way of knowing if my print has a "structurally sound " design. Another concern I have with my design is the ball bearings which are supposed to spin the pen holder spire. I have no way of even knowing if they will function properly, as I cannot