Customized 623ZZ Flange Bearing (Pulley)

Hello dear community

Actually i'm building the Hypercube 3D printer from Tech2C http://www.thingiverse.com/thing:1752766 and the part list has some items with a very long shipping time...

To keep the build time as short as possible i've designed my own F623ZZ flange bearing. :)
With two F623ZZ flange bearings you're able to lead a GT2 belt around a corner.

All you need is a old pc fan and his bearings. This pulley needs two bearings.
The inner diameter is 8mm and the outer dimensions