Layer lines and banding on resin prints
Layer lines are visible horizontal lines on a resin print, either at one height or repeating in bands. Some layer texture is normal, but strong distinct lines usually mean something shifted, paused or changed during the print.
Most likely causes (in order)
- Mechanical play in the Z axis or plate: Wobble or a loose plate can shift layers slightly and leave lines.
- Peel settings: Aggressive lift speed or too short a lift distance can disturb layers.
- Exposure inconsistencies: Under-exposure makes weak bonds that show as lines.
- Temperature changes: A room that cools during a long print changes how the resin cures.
Settings to change
| Setting | Change | Why |
|---|---|---|
| Normal exposure | Increase in small steps (+0.2–0.5 s) after a calibration test | Layers must bond to the previous one. |
| Lift speed / distance | Slow lift speed; increase lift distance | Reduces peel stress and lets resin flow back. |
| Hardware | Tighten plate and check Z rail; top up resin | Mechanical play causes lines (Lychee: Layer Lines). |
Exact values depend on your printer and resin. Start from the resin maker's recommended settings and change one thing at a time.
Quick checklist
- Tighten the build plate and vat; check the Z rail and lead screw
- Slow down lift speed; increase lift distance
- Keep the printer in a stable 20–30 °C space
- Run an exposure calibration test
- Use a smaller layer height for minis if your printer supports it
FAQ
Why does my resin print have lines at the same height?
A line at one height is usually a one-off event: a shift, pause, or peel problem at that layer. Repeating bands point more towards mechanical issues in the Z axis.
Can I sand out layer lines?
Yes, light sanding and primer can hide minor lines, but fixing the cause gives better results on detailed minis.
Not sure which one you've got?
Upload 1–4 photos of the failed print and PrintCleric ranks the likely causes and tells you exactly which settings to change, with sources.
Sources
Related fixes
- Layer separation / delamination in resin prints
- Failed supports: model stuck to the FEP, only supports printed
- Nothing on the build plate (print stuck to the FEP)
- Suction cups and blowouts (volcanoes) in hollow resin prints
- Elephant's foot (flared bottom layers)
- Blooming and over-exposure: soft details and rough surfaces
Wear nitrile gloves and eye protection when handling uncured resin, and work in a ventilated space.