The Anycubic Kobra X maintenance guidance says to apply a small amount of lubricant along the X-axis guide rail , then gently move the printhead back and forth so it spreads evenly.

Practical spots

  • Put lubricant on the metal rail/guide where the head moves, not all over the plastic parts.
  • Move the printhead through its travel after applying it so the grease or oil distributes evenly.
  • Community advice also points to lubricating the sliding metal guides and, separately, keeping the rest clean rather than over-greasing.

What not to do

  • Don’t pack it with too much lubricant, because excess can attract dust and end up where you don’t want it.
  • Avoid putting the wrong type of lubricant on the wrong surface; one common rule of thumb is oil for rails and grease for lead screws, depending on the part.

Video context

There are also recent maintenance videos showing Kobra X lubrication and teardown work, which match the same basic idea: clean first, then apply a light amount to the moving metal contact points.

TL;DR: lube the X-axis metal guide rail lightly, then move the printhead to spread it.