Wanhao i3 X - idler upgrade

The upgrade of a second total fail in Wanhao ingeneering.

Standard idler bolt has only one fixing point. When belt is tightened proprly the idler bolt tends to move to side and idler bearings work under heavy stress and get destroyed quickly.

This upgrade adds a missing wall in Z zxis bearing bracket and alows to mount x-axis idler properly with two mount points.

you will need:
x1 M5x45 bolt
x1 M5 nylon nut
x1 M5 ordinary nut
x4 M3x15-25
a pile of m5x1 washers
x2 5x11x4 bearings