About this 3D model

This is a filament clip for all filament diameters up to 4mm and all spools. It doesn't rely on anything being of any particular size and you have 4 options to adjust tension (more if you get creative). It also doesn't require a precise printer and it will never need to be replaced with frequent or prolonged use once printed. It has been designed and tested on my 1.75mm filament but I sized it for larger than 3mm filament. It fits well within the side walls of my current filament roll at all 4 tensions (with the weakest tension still holding it steady). I made it to fit within a filament roll of about 3.5cm. It is possible I may need to shrink it for 3mm filament in a smaller roll, or I may need to make an accessory (which I have already thought of) for multi-pronged spool holders. Hopefully the design doesn't require modification, but if it doesn't work for you please provide feedback and I will adjust as necessary.