Off center when "Prepare to Print"

[DougDR]

After centering my work piece I go to "Prepare to Print" and the part moves off center ,,,, Why?

[Darrell]

How about checking the "G-Code" tab of your process and looking at "Global G-Code Offset". I did a quick test and these offsets do NOT show up on your part's position on the build platform until you "Prepare to Print" and see the Preview.

[brian442]

I'd say you either need to set your global offsets back to zero on the G-Code tab, or you have the "apply toolhead offsets to gcode coordinates" option enabled on the G-Code tab (presumably because your firmware has incorrectly toolhead offsets, read more here: https://www.simplify3d.com/support/faq/#faq-4709)