Some clear prints may become hazy or whitish when they are cleaned with alcohols, such as ethanol and isopropanol IPA, and even with our non aggresive Cleaning Fluid Bio.

Summary:

  • Cleaning Fluid Bio is biocompatible, odorless, does not chemically attack prints but it can cause whitening of clear prints
  • Cleaning Fluid NW1 Bio is biocompatible, does not chemically attack prints, nor cause whitening of clear prints. It is supplied in 2 versions:
    • odorless biocompatible version (ultra safe, non potential skin irritant)
    • balsamic fragance version with antimicrobial, antifungal and antibacterial activity (potential ultra mild or mild irritant of sensitive skin) 
  • alcohols, such as ethanol and isopropanol IPA kill the sense of smell, chemically attack prints, causing whitening and embrittlement

Comparison of different methods for cleaning and post processing

The following cleaning and post processing methods are evaluated and compared for obtaining maximum clarity, transparency and mechanical properties of your prints: 

Method 1: Light box post-curing of prints in immersion/dipping  (recommended process)

Features:

  • fast & easy process, recommended with the required usage of Cleaning Fluid NW1 Bio (odorless version yields improved transparency and biocompatibility)
  • without the usage of Cleaning Fluid NW1 Bio maximum clarity of clear resi ns will not be obtained independently of the resin used 

Process:

  • 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
    • warm the cleaning fluid up to 60-70ºC when using high viscous resins to facilitate the removal of sticky and viscous 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 postcuring

Method 2: Light box post-curing of dry prints in air atmosphere (not recommended)

Features:

Process:
  • after printing cut the supports and drain and eliminate the uncured resin by gravity from the surface of the prints in the upside down position in an oven heated at 65ºC for 15 minutes (rotate the prints if needed for maximum drainage and leak out by gravity)
  • optionally use compressed air or a centrifuge to eliminate the maximum quantity of uncured resin from the prints
  • postcure the dry prints in a normal light box for 15 minutes at room temperature
  • turn the prints upside down and  postcure them for other 15 minutes
  • clean and remove any residual stickiness by spraying ispropanol isopropanol IPA on the prints (use a spray bottle to ensure that clean IPA is always used)
  • optional: wash/clean the prints with water 

Method 3: Cleaning with alcohol or IPA followed by light box post-curing of dry prints in air atmosphere (not recommended)

Features:

  • Alcohols, such as ethanol and IPA, reduce significantly the mechanical properties and chemically attack prints, causing whitening, weakening and fragililty
    • it is recommended to use as alternative our recommended Cleaning Fluid NW1 Bio,  which does not cause any whitening nor decrease the mechanical properties of prints
  • if clarity is not important, and with colored prints, Cleaning Fluid Bio can be used as alternative to alcohols because it does not attack, nor decrease the mechanical strength of prints (but it can cause whitening as alcohols)

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