Use this clip to store your filament spool and prevent it from unwinding itself. Instead of clipping the filament the the spool itself, this clip is attached to the filament itself. Therefore it can be used with any kind of spool.The clip is originally designed for filament up to 3mm and is very easy to use. Depending upon the exact diameter the clip will easily slide over the end of the filament (see picture with the blue filament) or it can be put on the end of the filament as a kind of 'cap' (see picture with the yellow & red filament)This clip can also be used for other diameters filament, simply scale the clip in Cura or in the other slicing software you are using OR... Just use the 175-v1 version of the clip, especially designed for 1,75 mm filamentUpdate V2.1: Modified the STL file: - the default orientation of the clip is changed - higher resolution stl-fileUpdate çlip175-v1.STL : I created a new version of the clip especially for people using 1,75mm filament. Simply download this version for your 1,75mm filament