Sewing Thread Spools Organizer

Updated to ver. 1.3: 

• Each pin base is more reinforced, according to suggestion in the comment. 

I need a box for all of my sewing thread spools organized. As my spools are of 500 m sizes, bought at Lidl, no one of the Aliexpress organizers are suitable for this purpose. I decided to design my own, and print it. The result is here. It can keep up to 33 spools. As I am pleased with the solution, as always, I will to share it with you. 

The design is made for these spools (DIA 27.5x61 mm) and a plastic box for food of 1.5L/50oz. What is the minimum inside dimensions of the box is shown on the pdf drawing presented here, to help you decide if your box is enough good. 

If you put some pin or a pen in the hole behind of this holder, you can have it as a display for all of your thread spools, for example, presented on a shelf.