Im using PLA. The first layers print fine. After about the first 2mm, spaces between the layers develop. The layers are not sticking together very good either. I don't know why the first layers print good but then the rest don't. I also noticed on another print, the first layers printed fine but the middle of the print had the typical spaces between layers. However, the quality of the print is good in random sections towards the top. I will attach an updated print.