So firstly, this is actually a remix. I just can't for the life of me find the original post/designer. Please let me know if you have seen a similar design that you could link me to so that I can properly update this post. 

I did make this again from scratch in blender to test my skills and use a bunch of modifiers to make it slightly modular. 

It is also scaled up form the original so that it can fit all the filament boxes I had. I had to break it up into two parts so that it could print on my printer. 
 

Bowties:

• The bowties are for assembly and the horz is toleranced for the horizontal cutouts and vise versa for the Vert ones. Since the Vert holes are printed… vertically there is a slight difference in its dimensions so that is why two bowties were needed. 
• I glued them in regardless but I wanted a snug fit. 

There is also a groove where the two sides meet on the bottom. That was intended as a spot for a plastic welder to deposit some plastic for better adhesion if needed. So you can keep things nice and flat and looking good. I never needed to use it but I liked having the option.