Resin-based 3D printers, such as SLA and DLP printers, use liquid resin to create high-quality, detailed prints. However, knowing how to handle and store resin properly is crucial for ensuring consistent print quality and maintaining the longevity of your printer. One of the common questions 3D printer users have is: “How long can you leave resin in a 3D printer?” This guide explores the factors that determine how long resin can be left in the printer, the risks involved, and best practices for handling resin when it’s not in use.
Understanding Resin and Its Behavior
Resin is a liquid photopolymer that hardens when exposed to UV light. Unlike filament used in FDM printers, resin is sensitive to environmental conditions like light, heat, and air exposure. If left in the printer’s vat or tank for too long, it can cause several issues, ranging from degradation of the resin to potential damage to the printer itself.
How Long Can Resin Be Left in a 3D Printer?
The amount of time you can safely leave resin in your printer depends on several factors, such as the type of resin, environmental conditions, and how well the resin is stored. In general:
- Resin can be left in the vat for up to 1-2 days without significant issues. However, if you plan on not using the printer for longer than this, it’s best to remove and store the resin properly.
- Extended periods of resin exposure, like several days or weeks, can lead to resin thickening, contamination, and curing. The longer it sits, the higher the risk of these issues.
The exact time resin can be left in the printer without degrading depends on both internal and external factors, which we’ll discuss in more detail below.
Factors Affecting How Long Resin Can Stay in a 3D Printer
1. Exposure to Light
Resin begins to cure when exposed to UV light. Even ambient light from windows or indoor lighting can cause slow curing over time if left in the printer’s vat.
- UV Protection: Many resin printers come with UV-blocking lids or covers to protect the resin while it’s not in use. If your printer doesn’t have this feature, it’s essential to ensure the vat is covered or stored away from any light sources to avoid premature curing.
- Opaque Containers: Use opaque containers if transferring the resin to a separate storage solution to minimize light exposure.
2. Temperature and Humidity
Extreme temperatures or high humidity can also negatively impact the resin’s performance. Resin tends to thicken and lose its flow properties when exposed to cold temperatures for too long, while heat can cause it to degrade or start curing in the vat.
- Ideal Storage Temperature: Aim to store resin and run prints in an environment with a temperature range between 20°C and 25°C (68°F to 77°F). Avoid exposure to direct sunlight or placing your printer in areas with fluctuating temperatures.
- Low Humidity: Humidity can introduce moisture into the resin, which can affect print quality. Keeping the resin in a low-humidity environment is essential.
3. Contamination
Leaving resin in the printer’s vat for extended periods can lead to contamination. Dust particles, debris, or skin oils can get into the resin, affecting print quality or clogging the printer’s components.
- Cover the Vat: Always cover the vat if you leave resin in the printer for more than a few hours. Many manufacturers include dust covers for this purpose.
- Clean the Vat Regularly: If resin has been sitting in the vat for more than a few days, check for contamination, and filter it before using it again.
Risks of Leaving Resin in the Printer for Too Long
1. Resin Degradation
Resin left in the vat for extended periods can degrade, which affects its chemical properties and print quality. Over time, resin may start to form clumps or lose its viscosity, which can lead to failed prints.
- Separation of Resin Components: Some resins may begin to separate into different layers if left undisturbed for long periods. Stirring or shaking the resin gently before printing can help re-homogenize it, but it’s better to avoid leaving it in the vat for too long.
2. Difficulty in Cleaning
The longer resin sits in the vat, the more difficult it becomes to clean. Cured resin may stick to the bottom of the vat, potentially damaging the FEP film or LCD screen during removal. Clogged printers can also lead to misprints or further maintenance needs.
- Use Resin Filters: If you decide to leave resin in the printer overnight or for a couple of days, filter it before your next print to remove any small particles or cured pieces that may have formed.
3. Potential Printer Damage
If resin starts to cure inside the vat, it can damage sensitive components of your 3D printer, including the FEP film, the build platform, or the LCD screen. In some cases, cured resin can even stick to the printer’s components, requiring time-consuming and costly repairs.
Best Practices for Storing Resin
If you need to stop printing for an extended period, it’s essential to properly store the resin to maintain its quality. Here are some best practices:
1. Remove and Store Resin
If you’re not planning to use the printer for more than 2-3 days, it’s advisable to remove the resin from the vat and store it properly.
- Use an Opaque, Airtight Container: Store resin in its original container, which is usually opaque to block light, or transfer it to an airtight, UV-blocking container.
- Label Your Resin: Always label your resin containers with the type and date when it was last used. This will help you keep track of the resin’s age and condition.
2. Filter the Resin
Before storing, always filter the resin through a fine mesh to remove any cured particles, debris, or contaminants.
- Resin Filters: You can use disposable resin filters or reusable metal strainers specifically designed for this purpose.
3. Clean the Vat and Printer
After removing the resin, thoroughly clean the vat and any components that may have come into contact with the resin. This will prevent buildup or cured spots from affecting future prints.
- Use Isopropyl Alcohol (IPA): IPA is excellent for cleaning both the resin vat and printer components. Make sure to wipe everything down and allow it to dry before storing your printer.
FAQ: Common Questions About Resin Storage
Q: Can you leave resin in a 3D printer overnight?
A: Yes, leaving resin in a printer overnight is generally safe, but it’s recommended to cover the vat and minimize exposure to light. If you plan to leave it longer than 24 hours, consider removing and storing the resin.
Q: How do you know if resin has gone bad?
A: Resin that has gone bad may appear thick, clumpy, or discolored. It may also separate into different layers if left undisturbed for too long. If the resin shows any of these signs, filter it thoroughly before use or discard it if necessary.
Q: Can humidity affect resin in a 3D printer?
A: Yes, high humidity can introduce moisture into the resin, which can cause issues with print quality and lead to failed prints. Always store resin in low-humidity environments.
Q: Can resin be reused after removing it from the printer?
A: Yes, resin can be reused as long as it has not cured or been contaminated. Always filter the resin before placing it back in the vat for your next print.
Q: How do you clean resin from the 3D printer’s vat?
A: To clean the vat, pour out the resin, filter it, and then use isopropyl alcohol (IPA) to clean any remaining residue. Wipe down the vat with a lint-free cloth and allow it to dry completely before using it again.
Conclusion
Leaving resin in a 3D printer for short periods, such as overnight or up to 2 days, is generally safe as long as the vat is covered and protected from light. However, leaving resin in the printer for extended periods can lead to degradation, contamination, and potential printer damage. To avoid these issues, it’s essential to store the resin properly when not in use, keep the environment controlled, and clean the printer regularly. Following these best practices will help maintain the quality of your resin and ensure your 3D prints come out clean and precise.