Help! X-Axis stepping out

Hi - please see attached pic. The X axis is shifting to the left - the object in the pic should have a vertical left face. The object has not shifted on the bed so must be a motor thing? Maybe belt slip? The X axis seems to move smoothly enough.

Any input appreciated

Cheers

No picture...

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

Image added (didn't spot the size error)

Cheers

Turns out it wasn't hardware or software - more like a user malfunction :-(

The filament reels fouled on the x axis motor which caused the filament to tension which caused the filament drive to pull the printer closer to the reels which caused it to foul on the x axis motor even more which caused the filament......etc etc. It pulled so tight that the printer lifted itself onto 2 feet and once something gave it dropped back down again - hence the huge horizontal discrepancy.

I tried again and unbelievably the filament somehow had a crossover on the reel and tied itself in a knot. So this time the drive motor couldn't shift it and just wore a channel in the filament instead of feeding it.

Think I picked a bad time to print my Secret Santa!!

Thanks anyway

Filament tangling on the reels is one of the problem areas that no one seems to have addressed. I have run into similar problems in the past. I've been fighting it by trying to be more careful about how I handle the filament spool. I try to always keep some tension on the filament and never let it flop loosely. It seems to help, but I'm sure, the next time I run a 28 hour print, it will tangle about 27 hours in.

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]