This is a remake of the z axis support replacement part found here:

http://www.thingiverse.com/thing:175137

I have made it so that you can remove the z axis rod at will and it has a double bearing support as well as a sturdier mounting via two screws. Like the original it will fit the 608 Ball bearing type bearings.

Print the part, attach to the k8200 frame near the top and insert the two bearings and z axis rod. Use m8 nuts to secure the rod to the bearings as shown in the picture