spool holder

i received my 3d printer recently with a spool holder that i feel can be improved even if just a little

my printer came with a filament spool that had 55mm hub, later i bought 2 hatchbox rolls that had 30mm hubs, while printing they roll on an 8mm rod.

this is my attempt to making a spool holder for both.

i tried using a bearing at first but it failed, due to the bearing not having a cage built in.
after that i designed one with a cage, however the cage was too close to the inner and outer races so it bonded during print. so back to the drawing board.




------UPDATES-----

11/9 - edit 1:uploaded version 4 of bearing, have not tested but it should solve the original cage problem edit 2* i noticed a hiccup in repetier where the cage has a section that will still bond,therefore i do not recommend printing this yet, im currently redesigning the bearing itself.

edit 3 i have uploaded spool holder version 3 with edited internals to prevent contact with the inner beari