The problem is caused by wrong feedrate of Z-axis or wrong resolution Z-axis screw (1600 steps/mm). 

To solve this problem, please reset eeprom and try updated Makerware in our website: http://malyansys.com/support/download/

Or modify Z-axis feedrate for slicer manually. 

Makerware users: Please check [[Makerware|this link]] for latest Makerware support.