Yes, this is normal with the Wanhao i3 design. The most common fix is to cut a notch in the bearing block with a hacksaw as pictured. See this mod page for the complete instructions.
Bearing block mod
Another option is to replace the bearing block with a 3D printed one with the notch already cut out. You can download the file for the bearing block here: http://www.thingiverse.com/thing:1172838