Like the title says, I'm getting weird black lines through my prints at random layers.
I put a fresh nozzle on and a new Teflon isolator but I still got a line on my print.
Any ideas? I've got a 3dsolex i2k insulator installed, could it be that degrading or something? I'm also using a Bondtech QR extruder instead of stock. Filament is pretty new pla from Push Plastics.