Alexei Volkov
Thermoplastic polyurethane (TPU) is a material that is commonly used in 3D printing. TPU is a type of plastic that is known for its flexibility and durability. When using TPU for 3D printing, it is important to consider whether the filament needs to be dried before use. TPU is a hygroscopic material, which means it readily attracts and absorbs water molecules from the environment. This absorption of moisture can affect the quality of the print, leading to issues such as poor layer adhesion, inconsistent extrusion, and printing problems like bubbles and weak layers. To ensure optimal printing results, it is recommended to dry TPU filament before use, and proper storage is crucial to prevent moisture absorption.
Characteristics and values of TPU plastic drying:
| Characteristics | Values |
|---|---|
| Drying requirement | TPU plastic needs to be dried before use as it readily absorbs moisture from the air. |
| Moisture effects | Moisture absorption can lead to printing issues like bubbles, weak layers, and reduced print quality. |
| Drying temperature | Dry at a temperature between 40°C-50°C and 60°C. |
| Drying time | Dry for at least 5 hours up to 24 hours before each use. |
| Drying frequency | Dry TPU filament before each print, especially if it has been opened for more than 2 days. |
| Storage | Store in a dry place, preferably in a sealed bag or container with desiccant or silica gel packets to prevent moisture absorption. |
| Dehydration methods | Use a food dehydrator, oven, or filament drying tools/machines. If using an oven, ensure temperature control to avoid overheating and melting. |
| Humidity | Maintain humidity levels below 20% RH to keep the filament dry for extended periods. |
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What You'll Learn
- TPU plastic is hygroscopic, meaning it attracts water molecules
- TPU plastic should be dried before use to improve print quality
- Drying TPU plastic can be done using a food dehydrator or an oven
- Store TPU plastic in a dry place, preferably in a sealed bag with desiccant
- Moisture absorption can cause printing problems like bubbles and weak layers
TPU plastic is hygroscopic, meaning it attracts water molecules
There are various methods for drying TPU filament. One common method is to use a food dehydrator or an oven with temperature control to ensure the filament doesn't melt. It is important to monitor the humidity levels during the drying process, ideally keeping them below 20% RH. Another method is to use desiccants, such as silica gel packets, which absorb moisture from the air to prevent the filament from absorbing it. Proper storage of TPU filament is also crucial. It should be kept in a dry place, preferably in a sealed bag or airtight container, to prevent moisture absorption before printing.
Some signs that your TPU filament needs drying are visible quality problems, such as bubbles and weak layers, or a black rim on the spool indicating that the filament has stuck to itself. It is recommended to dry TPU filament before use, even if it is still factory-sealed, as it likely contains excess moisture. Additionally, prespooling a small amount of filament before printing can help prevent issues caused by the filament sticking to itself on the spool.
Overall, the hygroscopic nature of TPU plastic requires special attention to drying and storage procedures to ensure optimal printing results. Properly drying and storing TPU filament helps prevent moisture absorption, which can lead to printing problems and reduced print quality. By following recommended drying and storage guidelines, users can achieve successful and high-quality 3D prints with TPU plastic.
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TPU plastic should be dried before use to improve print quality
TPU plastic is a hygroscopic material, meaning it readily attracts water molecules from the environment. When used for 3D printing, a material that has gathered humidity may not behave as expected and can lead to printing problems like bubbles, weak layers, and poor layer adhesion. Therefore, it is recommended to dry TPU filament before printing to improve print quality.
When TPU filament is removed from its packaging, it starts to absorb moisture from the air. To prevent this, it is important to store the filament in a dry place, preferably in a sealed bag or container with desiccant or silica gel packets. These packets absorb moisture from the air, preventing the filament from absorbing it. It is also recommended to dry TPU filament before each use, especially if it has been opened for more than two days, as it can absorb excess moisture during this time.
There are several methods for drying TPU filament. One method is to use a food dehydrator, which actively removes moisture from the filament. If a food dehydrator is not available, an oven can be used, but it is important to monitor the temperature to ensure it does not get too hot and melt the plastic. A blast oven with forced air is recommended for more even heating. Another method is to use a filament drying box, such as the X1 or X1C, which increases the temperature around the filament. It is important to cover the filament and keep the lid closed during the drying process to increase the temperature and effectiveness of drying. Additionally, the filament should be turned periodically to ensure even drying.
The recommended drying temperature for TPU filament varies depending on the source, with suggestions ranging from 40-45°C to 60°C. The duration of the drying process should be at least 5 hours or longer, depending on the initial moisture content of the filament. It is important to monitor the humidity levels during the drying process, as filaments typically require humidity levels below 20% RH to remain dry for extended periods. After drying, the filament should be stored in a sealed container with desiccant to prevent moisture absorption during use.
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Drying TPU plastic can be done using a food dehydrator or an oven
TPU plastic is a material that needs to be dried before use. It is a hygroscopic material, meaning it absorbs moisture from the surrounding air. This absorption of water molecules affects the quality of prints. Therefore, it is recommended to dry TPU filament before printing.
When using an oven to dry TPU, it is crucial to ensure that the oven temperature does not exceed the recommended range for drying filament, which is typically between 35°C and 70°C. Ovens often lack precision in temperature control, so it is recommended to use a thermometer to monitor the temperature accurately. Avoid placing the filament too close to the heat source to prevent overheating and potential damage to the filament.
Before drying TPU in an oven, ensure that the filament is mounted on a spool. The oven should be preheated to the desired temperature, and it is advisable to keep the filament away from the direct heat source. The drying process can take a few hours, and it is important to ensure even heating throughout the filament.
Additionally, when drying TPU, it is important to maintain low humidity levels, ideally below 20% RH, to prevent moisture absorption. Proper filament storage after drying is also crucial, such as using vacuum-sealed bags or silica gel packets, to extend the dryness of the filament.
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Store TPU plastic in a dry place, preferably in a sealed bag with desiccant
TPU plastic is a hygroscopic material, which means it attracts and absorbs water molecules from the environment. This absorption of moisture can cause issues when printing with TPU, such as poor layer adhesion, bubbles, and weak layers. Therefore, it is crucial to keep TPU dry during storage and before printing.
When storing TPU plastic, it is recommended to keep it in a dry place. Ideally, store it in a sealed bag or airtight container to prevent moisture absorption. Using desiccant packets or silica gel can also help keep the TPU dry by absorbing any moisture from the air. These desiccant packets are similar to those found in new shoe boxes.
It is important to note that TPU should be dried before each print job. Even after taking the filament out of the bag, it starts absorbing moisture immediately. The recommended drying temperature for TPU is between 40°C and 50°C (some recommend up to 60°C) for at least 5 hours, although some sources suggest drying for at least 24 hours. Drying can be done using a food dehydrator or an oven, but care must be taken to avoid overheating, as it can damage the TPU.
By properly storing TPU in a dry place and drying it before use, you can ensure successful and high-quality 3D prints with TPU plastic.
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Moisture absorption can cause printing problems like bubbles and weak layers
TPU plastic is a hygroscopic material, which means it attracts and absorbs water molecules from the environment. This absorption of moisture can negatively impact the quality of 3D printing with TPU filament, leading to issues like bubbles and weak layers in the printed object.
When TPU absorbs moisture, it can result in poor layer adhesion, inconsistent extrusion, and reduced print quality. This is similar to how table salt exposed to air can become lumpy due to moisture absorption. The presence of moisture can cause printing problems like bubbles, which can affect the structural integrity of the printed object, making it weaker and more susceptible to damage.
To prevent moisture absorption, it is crucial to store TPU filament properly. It should be kept in a dry place, preferably in a sealed bag or airtight container, to minimize its exposure to moisture in the air. Some people use desiccant packets, silica gel, or dehumidifiers to help keep the storage area dry. Additionally, it is recommended to dry TPU filament before printing. This can be done using a food dehydrator, an oven, or other filament drying tools, ensuring that the temperature is carefully controlled to avoid damaging the filament.
The recommended drying temperature for TPU filament varies, with suggestions ranging from 40°C to 60°C, and drying times ranging from 2 hours to 5 hours or more. It is important to monitor the humidity levels during the drying process to ensure the filament is sufficiently dried. After drying, the filament should be stored in a sealed container with desiccant to prevent moisture absorption before use.
By taking these precautions and properly drying and storing TPU filament, you can minimize the risk of moisture absorption and the resulting printing problems, such as bubbles and weak layers.
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Frequently asked questions
Yes, TPU plastic needs to be dried before printing. TPU is hygroscopic, which means it attracts water molecules from the environment. This can lead to printing problems like bubbles and weak layers.
There are a few ways to dry TPU plastic. One way is to use a food dehydrator or an oven. If using an oven, ensure that it doesn't run too hot as this can melt the plastic. It is recommended to dry TPU at a temperature between 40°C and 50°C for at least 5 hours before printing.
It is recommended to dry TPU for at least 24 hours before printing to ensure that it is thoroughly dry. However, some sources suggest that drying it for 5 hours at a temperature of 40-45°C is sufficient.
To prevent moisture absorption, store TPU filament in a dry place, preferably in a sealed bag or container with desiccant or silica gel packets. This will help to keep the filament dry and prevent printing issues caused by moisture absorption.
