This is a versatile spool holder for Prusa I3 MK2/2S/3 frame. I am using the Area51's clever [ClipOn](https://www.thingiverse.com/thing:2640009) design. There is also a version for aluminium [extrusion frames](https://www.youmagine.com/designs/versatile-spool-holder-for-2020-extrusion-frames). You can use smooth rods or threaded rods of 8mm,10mm,12mm diameter (one version for each diameter). With smooths rods you can use something like alexrosa's [3D Print Spool Holder Filament Support](https://www.thingiverse.com/thing:2112075) or boksbox's [hub adapter](https://www.thingiverse.com/thing:1481725). If you prefer a hub with bearings you can print a design like butchja's [Universal Filament Spool Holder](https://www.thingiverse.com/thing:2070272) and mount it on threaded rod. You can use it as single filament holder or double filament holder (see photos and renders). I also included a clip (one for each diameter) for smooth rods. **Acknowledgements** Thanks to: Area51 for the [ClipOn](https://www.thingiverse.com/thing:2640009) Design. alexrosa for the [3D Print Spool Holder Filament Support](https://www.thingiverse.com/thing:2112075) butchja for the [Universal Filament Spool Holder](https://www.thingiverse.com/thing:2070272) boksbox for the [Hub Adapter](https://www.thingiverse.com/thing:1481725)