Head Sticking on X Axis rods during printing  

Head Sticking on X Axis rods during printing

New build and 5 days of frustrations... I have managed to get the machine to calibrate and to print the purse sign and part of the little mervin, however, 75% into the print he came of the bed and thats when the major problems started.

When I tried reprinting I had issues with head on the X axis, it was sticking and rattling a lot. I tried removing the pulley belt and making sure it was not to tight as well as checking the cogs for slipping but all seems fine. I rebuilt the extruder assembly to make sure everything was correct. I tried a Z calibration and it got and measure the 9 points ok. When I started a XYZ Calibration it starts going back and forth on the 1st point for a while then the X axis gets stuck and starts making a loud noise and finally gets fully stuck and stops the calibration. I can push the head and free it and it is ok for a few travels but when moving back and forth in very small steps it sticks... nothing is slipping. Could it be something to do with the bearing binding?

Can anyone shed some light on what the problem is and how to fix it?

Attached is a picture of what happen with Marvin and printing the vase.....