A very functional, useful, cheap and customisable 3D printer spool holder!
You print 4 of these.
You get 4 608ZZ bearings.
You get 4 larger style 8mm washers,i.e. 8mm I.D, >30mm O.D. is good.
You get 12 8mm nuts.
You get 8mm threaded rod to suit.
Put it all together! Note the spool holders have 2 flat sides and 2 stylised sides. Where nuts join USE the flat sides. Be gentle putting the rod in so as to not let the print crack.