Please help - printed circle is not really round!?

[basteluwe 1]

I have a problem with my newly self assembled Ultimaker Original+ that particularly appears when printing circles.

The result is not raelly round! I suspect a mechanical problem but have no idea where to look.

Please check attached pictures for reference.

Any advice???

[neotko 1,417]

Check this

http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#circles

[basteluwe 1]

Check this

http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#circles

 

Thank you! That link seems very interesting!