Instructions for Use IFU for ultrasonic cleaning of 3D resin prints

1. Introduction

Ultrasonic cleaning is an effective method for removing uncured resin from 3D printed parts, especially those with complex geometries, fine details, or internal cavities. High-frequency sound waves enable more thorough and uniform cleaning than manual methods.

2. Equipment and materials

• Ultrasonic cleaner: Select a unit appropriate for your part size. Typical volumes are 2–6 L for small to medium prints and 10–30 L for larger parts.
• Cleaning solution: Water is suitable for water-washable resins. For conventional resins, use dedicated 3Dresyns Cleaning Fluids. Avoid isopropanol (IPA) due to safety and performance concerns .
• Containers: When using cleaning fluids, place the part in a sealed container filled with the fluid and submerge this container in the ultrasonic bath filled with water. This prevents contamination and reduces risk.

3. Cleaning procedure

1. Preparation
   • Remove the print from the build plate and remove supports.
   • Perform a preliminary rinse using the selected cleaning fluid.
   • High-polarity, non-flammable fluids such as Cleaning Fluid Bio are recommended for ultrasonic cleaning of durable prints.
   • If IPA is used despite not being recommended, place the print in a sealed container or bag filled with IPA and submerge it in water inside the ultrasonic cleaner to reduce fire risk.
2. Ultrasonic cleaning
   • Place the print in a container filled with Cleaning Fluid Bio or the selected cleaning fluid.
   • Submerge the container in the ultrasonic cleaner filled with water.
   • Operate at room temperature (20–22 °C) to prevent warping.
   • Run for 4 minutes. For complex geometries, add an additional 2-minute cycle. Biocompatible prints may require longer cleaning times to eliminate leachables and extractables.
3. Post-cleaning
   • Remove the print and allow it to dry completely.
   • Inspect for residual uncured resin and repeat cleaning if necessary.

4. Special considerations

• Hollow prints: Ensure sufficient drainage holes and orient the part to allow cleaning solution access and air escape.
• Delicate features: Use gentle or low-power ultrasonic modes to avoid damage.
• Cleaning solution maintenance: Replace the cleaning fluid when it becomes cloudy or after approximately 20–30 prints.
• Biocompatible prints: Require maximum removal of leachables and extractables using water and dedicated cleaning fluids. For details, see IFU for biocompatible resins .

5. Safety precautions

• Never place flammable solvents such as IPA directly into the ultrasonic cleaner tank. Always use the container-in-water method.
• Operate ultrasonic cleaners in well-ventilated areas, away from heat sources and open flames (especially if IPA is used).
• Regularly inspect and maintain the ultrasonic cleaner to ensure safe and reliable operation.