Ethan Clarke
Bonding plastic to a 3D printer bed can be a challenging task. The first layer adhesion is essential as it sets the foundation for the rest of the print. There are several ways to improve bed adhesion, including adjusting the nozzle speed and distance, levelling the bed, and using a heated bed. If these solutions do not work, one can use an adhesive or print a brim or raft to ensure the plastic sticks to the bed.
| Characteristics | Values |
|---|---|
| Nozzle speed | Should be slow to give plastic more time to bond |
| Nozzle distance | Should be close enough to allow plastic to bond |
| Nozzle temperature | Should be specific to the filament type |
| Bed temperature | Should be specific to the filament type, slightly higher temperature may help first layer stick |
| Bed level | Should be flat to prevent warping or breaking |
| Adhesive | Should be 3D printing specific, e.g. Magigoo |
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What You'll Learn
Adjust nozzle speed
Nozzle speed and print bed adhesion are closely linked. If your nozzle is too cold, the filament will not extrude smoothly and may under-extrude, affecting bed adhesion. A partially clogged nozzle can also cause adhesion issues. Ensuring your nozzle is clean and at the correct temperature is important.
To adjust nozzle speed, you will need to adjust the retraction settings. Retraction is a feature of FDM extruders where the nozzle pulls back a small amount of filament before it travels along the X and Y axes. Adjusting retraction settings can help to prevent oozing and stringing, which are common issues with PETG filament due to its low viscosity.
To adjust retraction settings, set the retraction distance to 3-7 mm, increasing in increments of 1 mm until the stringing stops. The distance should be slightly higher for Bowden extruders than for direct-drive extruders.
It's also important to note that the speed at which the printhead moves when it isn't depositing material (travel speed) should be faster—around double the print speed—to prevent oozing and stringing.
Additionally, the nozzle height and distance from the bed play a crucial role in achieving proper bed adhesion. The nozzle height should be calibrated so that a piece of paper can be slightly moved or wiggled between the nozzle and the bed. This process should be repeated for each corner and the middle of the bed to ensure the bed is level.
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Adjust nozzle distance
Adjusting the nozzle distance from the bed of a 3D printer is crucial for achieving successful prints. The optimal distance depends on various factors, including the printer model, nozzle temperature, and printing material. Here's a detailed guide on adjusting nozzle distance:
Determining the Optimal Nozzle Distance
The ideal distance between the nozzle and the bed varies among different 3D printers and materials. However, a common recommendation is to maintain a distance of around 0.1 mm to 0.2 mm. This distance is often referred to as the "first layer height" or the "z-offset." It is essential because it ensures that the plastic extrudes properly and adheres to the bed.
Calibration Techniques
One common method for calibrating nozzle distance is the "paper method." This technique involves sliding a piece of paper between the nozzle and the bed. The paper should encounter slight resistance when pulled out, indicating a proper distance. The thickness of standard printer paper is typically around 0.1 mm, making it a suitable gauge.
Another calibration technique involves using a "feeler gauge," which consists of flat pieces of steel of varying thicknesses. You can slide the feeler gauge between the nozzle and the bed to measure the distance accurately. This method provides greater precision than the paper method.
Adjusting the Nozzle Distance
To adjust the nozzle distance, follow these general steps:
- Ensure the printer is turned off.
- Clean any residual plastic or filament from the nozzle.
- Rotate the Z-axis rods to move the print head vertically.
- Adjust the nozzle height until it just barely touches the print bed.
- Measure the distance between the print bed and the SuperPINDA (a bed levelling sensor).
- If needed, manually adjust the SuperPINDA height by moving it up or down.
- Tighten the SuperPINDA and perform first layer calibration.
- Start with the default Z-offset value (usually zero) and then decrease it gradually during calibration until you achieve the desired distance.
Fine-Tuning and Testing
After adjusting the nozzle distance, it is essential to perform a test print to evaluate the results. Observe the quality of the first layer and make any necessary fine-tuning adjustments. You may need to re-level the bed or tweak the Z-offset to optimize the print quality.
Additionally, consider the thermal expansion of the nozzle when heated. For example, if your cold nozzle is 0.1 mm from the bed, it may expand by 0.1 mm when heated to 200°C, resulting in a 0.2 mm distance. Therefore, it is crucial to account for temperature-related changes in nozzle height.
By carefully adjusting the nozzle distance and performing test prints, you can ensure optimal performance and high-quality results from your 3D printer.
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Adjust bed temperature
Adjusting the bed temperature is crucial for achieving optimal adhesion when bonding plastic. Different plastics have varying ideal temperature ranges, and slight adjustments within this range can significantly impact adhesion.
For Polyethylene Terephthalate (PET), a category 1 plastic, a higher temperature may be beneficial. However, it is essential to avoid excessive heat, as it can cause stringing or deformation.
For High-Density Polyethylene (HDPE), or category 2 plastic, a temperature range between 50°C and 65°C is recommended. At 50°C, the plastic can still be bonded, but there may be minor warping issues with more complex objects. Increasing the temperature to 60°C strikes a balance, providing good adhesion while minimising warping forces.
Category 3 plastics, such as Polyvinyl Chloride (PVC), often require higher temperatures. A bed temperature of 65°C can be effective for larger prints, while 60°C may be sufficient for smaller objects.
Category 4 plastics, including Low-Density Polyethylene (LDPE), and category 5 plastics like Polypropylene (PP), are challenging to glue and may require specialised adhesives.
Polystyrene (PS), a category 6 plastic, can be bonded using poly cement, epoxy, or cyanoacrylate. However, it is important to note that cyanoacrylate may not be suitable for all projects.
When dealing with category 7 plastics, which include polycarbonate and acrylic, epoxy adhesives are generally recommended. For polycarbonate, epoxy is the preferred choice, while acrylic requires an acrylic solvent adhesive for the best results.
ABS plastics, categorised as 9, can be bonded with ABS solvent adhesives or epoxy. While solvent adhesives are available, they may warp the plastic slightly. Therefore, epoxy is often the preferred choice for optimal results.
It is important to note that the bed temperature is just one factor influencing adhesion. Other factors, such as the first layer height, nozzle temperature, and surface preparation, also play a significant role in achieving a strong bond. Additionally, some plastics may require specific adhesives or joining methods like welding or mechanical fasteners.
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Use an adhesive
Using an adhesive is a common method to bond plastic. However, it is important to note that different types of plastics require different types of adhesives. For example, plastics in categories 1, 2, 4, and 5, such as Polyethylene Terephthalate (PET) and High-Density Polyethylene (HDPE), are very difficult to glue. On the other hand, plastics in category 6, such as polystyrene, can be bonded with a variety of options like poly cement, epoxy, or cyanoacrylate.
When bonding plastics, it is crucial to maximise the contact area between the surface and the adhesive. A larger contact area results in a stronger bond. Additionally, it is important to minimise peel force, as most adhesives cannot withstand much force in this direction.
If you are using an adhesive to bond a 3D-printed plastic bed, there are a few specific considerations to keep in mind. Firstly, ensure that your bed is level to avoid adhesion problems and potential warping or breaking of the print. Secondly, adjust the nozzle speed and temperature to give the plastic enough time to bond properly with the bed. Finally, consider using 3D printing-specific adhesives like Magigoo, which can be easily washed off once the print is complete.
In some cases, you may need to take additional steps before applying an adhesive. For example, you can use sandpaper to create a rougher surface, allowing the adhesive to grip better. Additionally, a primer can be applied to chemically change the surface and enhance the adhesion. However, always refer to specific instructions and recommendations for the type of plastic and adhesive you are working with.
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Print a brim or raft
Warping or curling is a common problem in 3D printing. Fused Deposition Modelling (FDM) involves melting filament material in a hot end nozzle, which is then set down on the build platform. As soon as the melted plastic leaves the nozzle, it starts to cool down, and this cooling process continues even as the first layer of the print is being built. This often results in the uneven cooling of layers, with the outer layers cooling faster than the inner layers, leading to warping.
To prevent this, 3D printing professionals use brims and rafts, which are based on the same principle but have different benefits and drawbacks. A brim is a series of lines printed around the bottom of the model, forming a large ring. These lines increase the surface area of the first layer and help to firmly fix the model to the build plate. Brims are suitable for designs that have a low risk of warping and a large base, as well as for exceptionally flat designs. They are easier to remove than rafts and do not complicate post-processing.
A raft, on the other hand, is an extra horizontal mesh layer printed below the actual print, built wider than the first layer. This provides a surface for the first layer to adhere to, improving adhesion. A raft can be made of multiple layers, according to your slicer settings. Rafts are more difficult to remove than brims and can result in a rough finish on the bottom surface of your print. They are best suited for large prints, materials that are prone to warping, or uneven build surfaces.
When deciding between a brim and a raft, a good rule of thumb is: if a brim will do, then use a brim. If warping still occurs with a brim, then it's time to use a raft.
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Frequently asked questions
A good first layer adhesion is essential because it sets the foundation for the rest of your print. You can use an adhesive right on the bed where the filament will land. You can also adjust the nozzle speed to give the plastic more time to bond to the bed.
You can use 3D printing-specific adhesives like Magigoo. You can also experiment with different adhesives to see what works best for you.
Yes, you can check that your bed level is flat. An uneven bed can result in your print warping or breaking. You can also slightly increase the bed's temperature to help the first layer stick.
You can try printing a brim or raft, which can help improve adhesion without the use of adhesives.
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