Simple location cube to be imported into Simplify3d (S3d) so that you can find the x,y coordinate of a part.

I use this to find a location to put a seam (the start point of a layer).

Just import the cube into S3d and move it to your desired location. It will show the x,y coordinate.

Enter that coordinate into your FFF profile settings under Layer >>>> Start Points >>> Choose a specific start point.

Preview the part and see how close it is. You may have to shift it a little but it will be generally pretty close!