z axis brackets V2 with bearings hephestos improvement max height 180mm

this is a remix of http://www.thingiverse.com/thing:1231956
the bearing's dimension: 5x16x5mm
the name of the ball bearing is 625zz
http://www.amazon.com/Bearing-Shielded-Miniature-Bearings-VXB/dp/B002BBCNG0
http://www.thebigbearingstore.com/625-2rs-625-zz-radial-ball-bearing-5x16x5/

i have changed the shape of the braket in order to it doesn't touch the x axis.
the max heighr that z axis can rise is 180mm.