Need Help with my delta ..

Hi there everyone , would anyone be able to help me with my delta printer - The problem is that all axis move but X axis (up and Down) movement just pulses? not sure y due to all axis do move ok when moved back. forward. left. right ..??

Many thanks for all your time
Paul

You can try turning up the power to the stepper motor on the 'Step Stick' (assuming you have standard hardware). You can also modify the firmware and lower the max step rate and acceleration for that motor.