Self sufficient spool holders for different kind of 20cm spools (width and central diameters).

thingiverse

I purchased numerous spools from various suppliers over time and noticed their central axis hole varied in diameter, along with differences in the spool's overall width. To solve this problem, I first developed a fixed-size holder, later shifted focus to creating an adapter for different diameters, and ultimately created a variable holder capable of accommodating any width. Simply print using low infill, without support structures.