print problem at same height in one direction

[Lekorlien 0]

I'm having printing problems with colorfabb XT at the same height, but only in some directions. the puzzeling thing is that a slightly offset direction gives a OK result?

[Titus 170]

It looks like a cooling problem. Judging from the print you are working on an UMO(+). The fan coming from one side could have this effect, although it's pretty intense here.

Could you supply the model, perhaps there is a better orientation? Or a dual fan setup could work. Alternatively you can use a big room fan and point it at the printer from the other side temporarily.

If all those are no option, print 2 of these models at once, that will allow the plastic to cool down more before starting the next layer. And print at a lower temperature if possible.

It could also be a stability issue, that the right leg of the print was moving during the print?