Cable-Spool with extender

thingiverse

This is a basic spool I created during my early days using FreeCAD. It's primarily intended for cable and wires, though it could potentially be used for filament as well if desired. The diameter may be slightly too small for filament use, but ultimately the decision is up to you. I've included the FreeCAD files, although I must warn that they're somewhat disorganized and wouldn't be a good starting point for any serious design work today. Despite their messiness, however, they do function as intended.