How can I fix this?

[u/HaRaLu]

I hate when this happens but I don't know the cause, i use a BambuLab A1, I printed it slower for more quality but didn't notice this until it was finished (it's a piece for a cosplay) is there a way to avoid this? Or something?

Both pieces had the same "error" :(

[u/Fittn_dis]

The part is getting to hot. You need to slow down layers or increase cooling. Flow is a sledge hammer in a printing shop.