Y Axis Wandering
                    Hi All,
                            I am new here, but not to 3D printing.  I have been using 3D printers for years at my work.  I decided to build one for myself and made a huge mistake buying a Chinese crap... Now, I have tons of problems.  I am not really sure if this is a good place to ask.
I am using Repetier Host and the Firmware on my i3 clone.  Here are two major problems I am facing now:
1. SD card does not read.  It detects the card, but shows no files in there.  I tried with 6 different cards and formatted them with FAT32.  I used gco extension with 8 characters max.  No luck.
2. When the printer prints, it wanders off to right side (Y axis) evertime it hits 30+ layer.  Somehow, motor does not want to pull the extruder back. It keeps going to right until it hits the end or I hit Reset button.  It makes that every time.  I could not get any finished object so far.  I tried different USB cables on different USB port combinations, result is the same.
I appreciate for any lead.
                
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