Answer
For PLA prints, use 220 or 320 for layer lines, then 400, 600, and 800 with light pressure.
Why it happens
Layer lines need gradual leveling. Too much pressure can heat or smear plastic.
Recommended grit
Use 220 or 320 for visible layer lines, then 400, 600, and 800 for smoother prep.
Wet or dry
Dry for shaping; wet for finer stages.
Success check
The print feels smoother and layer lines are reduced evenly.
What to do
- Remove loose print defects first.
- Use 220 or 320 for visible layer lines.
- Refine with 400, 600, and 800.
- Use light pressure to avoid heat buildup.
Avoid: Do not press hard enough to soften the plastic.