Very high frequency noise when the extruder moves.
you need to grease your bearings
I've use machine oil on x,y,z rods. Is this caused by not greasing bearings instead of rods?
The noise happens when I move extrude x axis. I couldn't tell whether it's from rod or bearing though.
Which bearing are you talking about? Is it on the left side of the printer or bearings in the extruder motor?