Skewed print

[Technosteve]

I haven't printed one of my printers for a while, and tried printing - problem! I am having trouble with my printer shifting the first several print layers over, consistently for 4 different items. For the first 10 layers or so, it gets shifted to the left, then proceeds to print normally after that.

I took those same files, and every one printed perfectly on my other M2 printer. I tried reloading the firmware ( I doubt this is hardware, as I just rebuilt the machine to ensure all screws were tight), and slowed print speed to a crawl to eliminate component shifting/table slap/jerk etc. After watching it closely, the printer definitely deliberately prints it skewed, and consistently skewed at that.

I decided to upload a different firmware - for use with the Greetech LCD, and now I have an additional issue. Now after the first several layers, the gap between layers jumps really high, making a big mess.

I attached a photo showing the skewing.

Any ideas on how to get my printer usable again?

I have the V4 hotend, all 24V, Rambo v1.2h

Thanks!

[Technosteve]

I just wanted to answer my own question here. I found a loose set screw on the gear pulley that connects to the stepper motor.

[3dPrintingMD]

The Z-motor is the key to which firmware you need to use, as different motors have a different # of steps.