What went wrong with this?

[Mjolinor]

The picture is of the same orientation as it was printed. The bottom cone where it is getting bigger is fine but the top cone where it is getting smaller came out knackered. If Madonna's bra had done that she would never have made so much money.

I did wonder if the other extruder had been hitting it but there is no green stuck to it so maybe not. It just looks as though maybe it was too hot when it got there or maybe it isn't waiting long enough between layers when it gets to the small bit at the top.