Uneven Layers!

Hello guys.

What we can do about uneven layers??

I check the belts

i check every screw

i check the bed

i change extruder

im waiting to change also extruder motor

also im waiting the hotends to do the unicorn nozzle mod.

dud i know that. you gotta tighten or loosen the belts and stuff

and how does it uneven… can you send a pic?

Put some grease on rods ?