Spool holder for Anet A8

I wanted spool holder for my Anet A8, that is mounted to printer and spools should be really easy to change. So i designed this. So big bearings are defenetely overkill, but i had theese lying around and just made all around them. Now i have discovered, that emtyer roll tends to slip on drum because of not so good bearings. I belive it should be ok without bearings too. My bearings inner diameter is 25mm and outer 47mm.