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Problem

What grit removes 3D print layer lines?

3D print layer lines remain visible after sanding.

plastic paint primer wet sanding
Answer

For 3D print layer lines, start with 220 or 320, then refine with 400, 600, and 800.

Why it happens
Layer lines need a grit that levels the ridges before finer grits smooth the surface.
Recommended grit
Use 220 or 320 for layer lines, then 400, 600, and 800 for smoother prep.
Wet or dry
Dry for early leveling; wet for finer plastic finishing if the material allows it.
Success check
Layer lines are reduced and the surface has an even scratch pattern.

What to do

  1. Start with 220 or 320 to reduce layer lines.
  2. Use light pressure to avoid heat buildup.
  3. Refine with 400, 600, and 800.
  4. Use primer if a painted finish is planned.
Avoid: Do not start with ultra-fine grit while layer ridges are still high.

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