¶ Definition
Poor layer adhesion occurs when printed layers don’t bond properly, resulting in weak, brittle parts that may crack or delaminate. Strong bonding is essential for durable, functional prints.
¶ Signs
- Layers separate or peel apart under light stress
- Visible horizontal cracks or splits between layers
- Parts feel fragile and break easily when bent
¶ Root Causes
¶ Printing Settings
- Nozzle Temperature Too Low – Filament doesn't melt enough to bond with the previous layer.
- Under-Extrusion – Printer is not extruding enough filament to form solid layers.
- Cooling Fan Too Strong – Rapid cooling before the new layer bonds leads to poor adhesion.
- Print Speed Too Fast – Layers are printed quickly without enough time to bond.
- Layer Height Too High – Reduces the surface area contact between layers.
¶ Filament Characteristics
- Moisture-Absorbed Filament – Wet filament causes inconsistent extrusion and weak bonding between layers, especially with nylon, PETG, ABS, TPU, and ASA.
¶ Hardware & Mechanical
- Extruder Motor Skipping – Motor lacks torque or grip, causing missed steps and under-extrusion.
- Incorrect E-Steps Calibration – If your printer is not pushing the correct amount of filament, layers may be too thin to bond properly.
¶ Step-by-Step Solutions
¶ 1️⃣ Dry Your Filament
Moisture is one of the most common causes of weak layer adhesion.
Dry filament before printing, especially if using Nylon, PETG, ASA, or ABS.
¶ 2️⃣ Raise Nozzle Temperature
Increase nozzle temp by 5–10 °C within the safe range to improve layer bonding.Hotter filament flows better and bonds more strongly to the previous layer.
¶ 3️⃣ Reduce Cooling Fan Speed
Too much cooling hardens the previous layer too fast, preventing good bonding.
For ABS, ASA, or Nylon: Turn the fan off or to very low.
For PLA or PETG: Reduce the fan to 30–50% and test the results.
¶ 4️⃣ Slow Down Print Speed
Fast printing reduces the time each layer has to fuse properly.
¶ 5️⃣Calibrate E-Steps (Extrusion Amount)
Incorrect E-steps can cause under-extrusion, making layers too thin to bond.
Measure 100 mm of filament, mark it, and extrude 100 mm.
If the actual extrusion is less or more, adjust the E-steps/mm in your firmware or slicer.
¶ 6️⃣ Lower Layer Height Slightly
Reducing layer height increases the bonding surface between layers.
Use 0.12–0.2 mm layer height for better strength (especially for fine details).
¶ Still Not Solved?
If the issue persists, please contact us anytime at service@overture3d.com.