This is a simple one-piece wall mounted "high-friction bearing" for holding ABS filament while printing.
I tried for a while to find a simple filementholder with no friction and true bearing, but i was not able to locate any that didnt require some ekstra equipment that i did not have inhouse. So I made one in pure plastic. This is a very simple wall-mounted filament holder drawn in autodesk inventor (file included in zip).
Print with 30% fill and 2 shells. Mount it on a wall above printer, add filament and start printing. :)