Vertex K8400 Z Axis Upgrade

Print the Z Axis Support twice for upper and lower parts and use the original screws and nuts. It must be printed with some infill to be more resistant. Beware of the warp if you print with ABS because it is a large piece.
The Ball Bearing for the upper part is 608Z.
Clean all screw holes first and place M3 nuts inside for Z rod mount.
When mounting the lower part do remove the power supply and even the Z driver from the mainboard.
On a flat surface roll the threaded rod to check if it i