Just add a sewing needle or 3D print a long thin cylinder.This is great for spools with small hubs. If your spools have large hubs you may need to print the spacer included, depending on your spools, you may need to adjust the spacer. Keep the center the same size and scale the outer rim as needed for best results.This is for the 1kg or less spools. It may support more, but use at your own risk!
Filament Guide Ultimaker 2youmagine.com
The Stilt goes through the hole. Glue the Stilt into the Plate. Then put the Roller on the Stilt - it should move freely. Put the Top on the end of the Stilt - done. Print each part speratly so you don't get spilkes from the retraction. I printed mine with PLA, 210°C, 75 Bed, 50mm/s, 0.1 Layer Height, 0.3 initial Layer height and 100% infill.Happy printing!
Filament dust filterredpah.com
with this part you can keep clean the filament (no dust inside the extruder) 1,75 or 3 mm on your printer. You can place it everywhere....up to you :-)size D24 x 13mmcut out a little piece of sponge (D20 x 10mm) and put it inside the sponge-holder...make sure that the sponge not opposes friction on the filament