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Topic: regarding my not printing in center problem

found this on Google forum:
Guys,
Just as a heads up to everyone regarding firmware at the moment, please do remember that the S3 firmware is just a little different than the S2 firmware. We haven't released the S3 firmware to the public yet, and at this time it is possible for people to make the mistake of uploading S2 firmware onto the S3. Please be aware of this particular complication should you be giving advice on the forums. The issues associated with the mistake are still be tracked down, but can relate to mysterious functionality deficiencies.

Regards,
John
dated Feb 23
maybe thats the issue?

SD3, E3D hotend,linear bearing on x/y axis',pillow block bearing on y conneting rod, ball bearngs on front y axis, fan on y stepper motor.