Get your spools up on the wall and out of the way! Here's a fast-printing, easy to use shelf for storing spools. There's the shelf itself and a support piece for those full or almost full 1 KG spools. 

I printed these at .3mm and only 10% infill. Use the insert-hollow-dual.stl from the original HSW, insert the support first, and then the shelf, and then snap it into your Honeycomb Storage Wall. 

You may not need the support for smaller, lighter spools. But if storing a full or almost full 1 KG (2.2lb) spool, it's essential. 

FreeCAD models included for customizing. Enjoy!