Most clear prints become hazy or whitish when they are cleaned with isopropanol, ethanol or even with our milder Cleaning Fluid Bio. The use of alcohols reduce significantly the mechanical properties of most materials, weakening and making them fragile. Learn more: Comparison of different methods for cleaning and post processing 3D printed resins

Cleaning and postprocessing protocol

The following cleaning method is automated, cost effective, fast and easy. It is recommended for obtaining maximum mechanical performance, clarity and transparency of your prints.


  • a low cost wash & cure machine of 100 Euro can be used, such as Wash & Cure Machine or a similar one

Light box post-curing of prints in immersion/dipping:

  • remove prints from the build platform with a spatula
  • dip prints inside a washing basket in a washing container filled with Cleaning Fluid NW1 Bio
    • it is odorless, ultra safe and non-flammable
    • warm the cleaning fluid up to 50ºC with eg a kettle to facilitate the removal of uncured resin from the prints
  • remove any uncured resin from prints by stirring the cleaning fluid with a magnet stirrer (wash mode)
  • once prints and washed and cleaned dip them again in the same or another transparent container filled with fresh and clean* Cleaning Fluid NW1 Bio
  • postcure prints at room temperature inside Cleaning Fluid NW1 Bio in the light box for 15-30-45 minutes (cure mode)
  • remove  Cleaning Fluid NW1 Bio from the surface of the prints with compressed air or with a clean cloth
  • cut the supports. If supports are too hard and brittle, leaving marks on the prints, cut them before light box postcuring

*Note: ideally use fresh unused Cleaning Fluid to avoid contamination of prints with uncured resin from previous washings. 

How to reuse dirty Cleaning Fluid? Expose the Cleaning Fluid in the washing container to sunlight, or with or without stirring to light in the light box or curing machine. After several minutes the uncured resin will cure as small particles. Then, use a paint filter to separate and remove the cured resin from the recycled cleaning fluid, which can be used again and again for washing prints.

Learn more about Sterilization of 3D printed resins for medical devices