Found my self having filament from many different manufakturers, and made this simple filament roller for my Aluminium Geeetech I3 pro.
I have another roller too, but this one do not care witch diameter the filament roll-core have.
I have used 4X standard ball-bearings from a local hardware store. 12x28x8 mm.
Can be assebeled without tools, but if you have a deburring tool for the shim holding the ballbearing in place, the entry is more easy, since its a wery tight fit.
No filamentguide, i find them just to be restrictive
Added one file with all parts, and also made saved files for all the different parts, so you can stack them as you like, you need right, left and 4X shims.
The filament runs really smooth on this "thing" :-)
Feel free to comment, and give suggestions for improvements.
Form Futura pla