Reliable first-layer adhesion is crucial for successful 3D printing. Besides the right bed temperature, adhesives and print bed surfaces play a central role. But when are spray adhesives useful? When is a glue stick enough? And do you need additional adhesives on PEI at all?
Here you will find practical tips for clean, controlled adhesion – without frustration when removing parts.
1. Basic Principle: Adhesives Are Often Release Agents
Many users believe adhesives only serve to increase adhesion. In practice they often fulfil a second important function:
👉 They act as a controlled release layer.
Especially with materials like PETG or ABS, they prevent the part from permanently bonding with the surface.
2. Glue Sticks (PVA-based)
When useful?
- PLA on glass
- PETG on PEI (as release layer)
- ABS with slight adhesion issues
Advantages
- ✔ Easy to apply
- ✔ Inexpensive
- ✔ Easily removable with water
- ✔ Good adhesion control
Pro tip:
- Apply thinly and evenly
- Clean with warm water after several prints
- Do not layer – otherwise unevenness occurs
3. Spray Adhesive & Hairspray
When useful?
- Large ABS or ASA parts
- Glass print beds
- Warping-prone prints
Advantages
- ✔ Very even distribution
- ✔ High adhesion
- ✔ Ideal for large areas
Risks
- ⚠ Overspray contaminates printer mechanics
- ⚠ Uncontrollable layer thickness
- ⚠ Harder to clean than glue stick
Pro tip:
- Remove bed and spray outside the printer
- Use thin layers
- Do not spray directly into the printer
4. PEI Print Bed – Do You Need Adhesives at All?
PEI (smooth or textured) is now standard in many modern 3D printers.
Advantages of PEI
- ✔ Very good adhesion with PLA
- ✔ Usually no adhesive needed
- ✔ Durable
- ✔ Easy removal with spring steel plates
When to use adhesives anyway?
- PETG on smooth PEI → as release layer
- Very large ABS prints
- When the part sticks too strongly
Cleaning is crucial
- Clean regularly with isopropyl alcohol
- No aggressive cleaners
- Grease-free surface is essential
5. Material-Dependent Recommendations
| Material | Surface | Adhesive useful? |
|---|---|---|
| PLA | PEI | No (usually not needed) |
| PLA | Glass | Yes |
| PETG | PEI smooth | Yes (release layer) |
| PETG | Textured plate | Rarely |
| ABS | PEI textured | Optional |
| ABS | Glass | Yes |
6. Typical Mistakes & Solutions
Part sticks too strongly
- Use adhesive as release layer
- Let bed cool completely
- Carefully flex the flexible plate
Part detaches during printing
- Clean the surface
- Renew adhesive
- Print first layer slower
- Enable brim
Uneven bottom surface
- Adhesive applied too thickly
- Surface unevenly coated
7. Advanced Tips
🔹 Less is more
Too much adhesive worsens surface quality.
🔹 Combination strategy
PEI + thin glue stick layer = controlled adhesion with PETG.
🔹 Use cold release
Many materials release almost by themselves below 30 °C.
Conclusion
Adhesives are not a sign of poor printer quality but a tool for process control. What matters is:
- Understanding the material
- Choosing the right surface
- Using adhesives selectively and sparingly
- Cleaning regularly
With the right use of glue sticks, spray adhesives and PEI, you will achieve stable first layers – without damaged print plates or stuck parts.