Alternative Filament Spool Holders for Raise3D N2/N2+

This are alternative Filament Spool Holders for Raise3D printers N2 and N2+ (N2+ untested).
I designed them because the originals had too much friction to the spools and created rattling sounds. Initially I thought this was a problem resulting in some air prints. In the meantime I know that it might be a piece of a puzzle, but not the only cause.
I minimized the friction by using 4 ball bearings of type 688 per holder.
I ordered these ball bearings:

http://www.banggood.com/Wholesale-10Pcs-