Calibration Issue

I am having an issue with calibration of the Cetus Extended. When I try to calibrate nozzle height on the top right and bottom left of the printer, the print head lowers and then it will eventually 'click' when getting closer to the bed. It does not reach a point where the nozzle puts any sort of pressure on the paper. After it clicks, I can not lower it any more even though the software says the head is lowering (I am using the Mac software). On other calibration calibration points, there is no such issue. Is there any ideas on a potential fix? Thanks!


You may reached the Z axis lower limit.  To solve the problem, loosen the 3 big screws on the veticle axis, lower the entire Z axis for a few mm, then retighten the screws. 


That did it! Thanks Jason!!