Printing problems

Hi folks , I have a strange problem....
Best seen in a picture. But I start printing it goes fine but as we get higher up in the print it goes wrong!
It doesn't seem to happen at the same height each time bit I can't get a complete print without problems
I'm printing on a Mendel 90
Let me have your thoughts
Regards
Steve

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Specialist prop makers. Pattern making,Fibreglass, foam carving, moulds, silicone rubber,
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what slicer are you using.?

you might want to look into cool settings.

Is that PLA you're printing with? If so, do you have a fan cooling both the in-progress print and also your hot end barrel?

I'm currently using Slicr
Steve

Yes I am using pla but I don't always have the fan fitted, could toss cause this problem?
Steve