small universal filament spool holder

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I used 4 608 bearings and four M4 bolt (16mm long) + nuts.
If you dont have any bearings than you can print _"small filament spool holder Bearing repl.stl"_ to replace those bearings.
Be carefull not over tighten as you can break the part.
Only... they are too small for the black spools (it will tipover). You can make them longer - and they work just fine:
http://www.123dapp.com/123D_Design/smal-filament-spool-holder/2400176