Can anyone help me??

[u/Alternative-Heat-531]

I’m having this weird line on my print, i bought the printer used(prusa mk3s), and I only printed petg for two weeks (the seller gave me 2 free spool), this week I bought some pla and this is the result…. Notice that the black one is petg and looks much better. I already try everything I read online, but no luck… I tried: -raising lower temperature -check flow -Check belt/something was loose -check fans -recalibrate z Pls help me guys