Geeetech Rumba. Fill does not follow the contours.

Hallo!

I use a Geeetech Rumba control cards. When the printer is printing, the first contours is OK,
but when the printer starts to make a filling, between contours, is it as if X and Y change place,
and the printer goes in a completely different direction than it should. Eventually it reaches the end positions.
Does anyone know what is incorrect.

AndOsb

Check acceleration and motor current. Set acceleration for x and y to 1000mm/s2. Also make sure tha axes move without binding. search the reprap.org wiki to set motor current.

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Kind regards
Imqqmi

NFAN CoreXY printer:
[reprap.org]

Thanks Imqqmi I shall test that.
It seems as, if it is going in (+X,+Y) direction, it works all right, but when it should go in (-X,-Y) just -X works.
I have tested to print a 3D-figure with 8 corners, and that works OK in all 8 directions, when it writes the contour.