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Problem

What grit for ABS 3D prints?

ABS 3D prints have layer lines or rough support marks.

plastic wet sanding dry sanding scratches
Answer

For ABS prints, use 220 or 320 for marks, then 400, 600, and 800 for smoothing.

Why it happens
ABS can be sanded, but coarse grit can damage detail and pressure can create heat.
Recommended grit
Use 220 or 320 for support marks, then 400, 600, and 800 for smoothing.
Wet or dry
Dry for shaping; wet for finer stages.
Success check
The print has reduced layer lines and an even scratch pattern.

What to do

  1. Clean the print surface.
  2. Sand support marks with 220 or 320.
  3. Refine with 400, then 600 or 800.
  4. Use light pressure around small details.
Avoid: Do not over-sand small edges or printed details.

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