When plotting some small shapes, lines and circles, the accuracy decreases further on the y-axis.
Here is a example:
https://www.dropbox.com/s/f5flzkjr0jkn9tz/IMG_7924.JPG?dl=0
The circles are not round anymore and the start point of the lines as well.
The carriage of the y-axis becomes lower when all the way out. I measure 2mm less hight of the pen at the end than at the home corner.
Any tips or ideas how to make it better?