MakerBot Spool Holder with Bearings

I was quite often in the situation, that a Print was incomplete because the friction of the spool to my self - printed Spool Holder was too high! So I thought a Spool holder with Bearings could do the trick...
I tried to construct something stable enough to hold heavy Spools but on the other Hand being light enough to roll well on the Bearings! I have also included the 123D Design Files, so you can adapt it to your needs! Have fun...