I've created what I call a 'Calibration plot' that I think may be helpful to others. It uses the egg bot template and creates vertical, horizontal, and diagonal lines over the entire area and also plots circles in every other square. I found it helpful to understand how plots are realized on an egg or any other shape. Specifically on an egg how things are stretched and squashed on different sections of the egg. The lines should also intersected correctly. Also, how the pen lands on the eggs makes a difference (i.e. is it perpendicular). I think it would be an excellent first plot for anyone new to the egg bot or if you think it is not plotting correctly. I would make it available on this post, but I do not see a way to attach the file.
If you are interested, I would be happy to send you the file.