Geeetech

No it doesn't run fine in up direction. It moves a few mm and stops up or down.

Yes, gantry is the same height left and right.

I have limit switches in transit and will install a new one when I receive them.

The z-axis move correctly(down). It just moves a few mm then stops.

I've been dealing with problems on this 3d printer for 6 months. Now, the z-axis moves only a few mm on home then stops. I have checked the rods, they are straight, I have checked that the z-axis is level. I have loosed the brass nut screws slightly. Both sides of the z-axis start and stop at the ...