Resin care


The photopolymer resin that Ember uses should be treated with the same care to you would use to handle a strong cleaning product, such as bleach. The following guidelines will help to assure their safe use, storage, cleanup, and disposal. 


Whenever handling resin, always wear protective gloves, protective clothing, and eye & face protection. Avoid contact with your skin and eyes. 

If any resin does get on your skin, immediately use soap and water to wash it off. 


Store in a place that's out of reach of children and pets, and which is not exposed to direct sunlight. Always keep the lids of the resin bottles tightly closed when not in use.

How and why to clean your resin 

If you've had a print fail, then you'll probably have cured resin in your resin tray. You will find this cured resin adhered to the resin window (PDMS), and also floating freely through the liquid resin. If left in the resin tray, this cured resin will likely cause your next print to fail. Therefore, it's necessary to remove the cured resin from your tray after every failed print. 

Removing cured resin from the PDMS is easy: Simply use a gloved finger to dislodge it from the PDMS, and then remove it from the tray. 


Never use a metal tool to clean the surface of the PDMS, as this will scratch and damage it. Also, do not wipe the PDMS with a paper towel, as this will also scratch and damage its surface. Only use a gloved finger to dislodge and remove cured resin from the PDMS. When you remove cured resin from the PDMS, have a paper towel handy to receive the debris and catch any resin drips as you take it to the trash.

See below for guidance on the proper disposal of resin and objects with liquid resin on them.

Once you've cleaned the PDMS, you'll also need to filter the resin. There are two ways to do this: Using a fine-toothed comb to clean the resin, or pouring the resin through a paint filter.   

Using a comb to clean the resin

This is the faster, but less thorough resin cleaning technique. It works well for quickly removing larger pieces of cured resin, without requiring the removal of the resin tray from the base plate. This video demonstrates the process: 


To avoid exposing your resin in the process, be sure to filter your resin in an area that's not exposed to any direct sunlight or any kind of bright light.   

Using a filter to clean the resin

For a more thorough resin cleaning, pour the resin through a paint filter to remove the cured debris. For ease of filtering, set up a jig to hold the filter above the resin bottle. 


Don't pour used resin back into a fresh resin bottle. We recommend you keep an old resin bottle on hand to store used resin.

Make sure to filter the resin before pouring into a storage container, to remove any cured particles.

To completely clean a resin tray, empty the tray of resin and then spray isopropyl alcohol (IPA) into the tray and then wipe clean with with a paper towel. [Do not wipe the PDMS with a paper towel, as this will scratch and damage it.] Also, use an isopropyl alcohol swab to gently clean the underside of the glass, removing all smudges and smears.

DANGER Keep Isopropyl Alcohol swabs away from heat / sparks / open flames / hot surfaces.


Working with multiple resins

If you're using multiple resins, never mix them in the same tray or storage container. The best practice is to use a separate resin tray for each resin. If you must use a single tray for multiple resins, first thoroughly drain the tray, wipe out the excess resin, spray it with IPA, and wipe it again with a paper towel.


Never wipe the surface of the PDMS window with a paper towel. The roughness of the towel will cause damaging micro-scratches on the surface of the window. Only use a microfiber cloth or lens paper to clean the PDMS window. For more info, check out the article, Resin tray care.  

Once the tray is completely clean, you may then add a different resin. 


Liquid resin must be disposed of either by curing it in the sunlight or according to local regulations. It should never be poured down a drain, flushed, or put in the municipal trash in liquid form.

To cure liquid resin, seal it in a plastic bag and leave it in the sunlight until it hardens. You can then safely dispose of it in the trash.

Alternatively, you may dispose of liquid resin by sealing it in a plastic container and disposing of it according to local regulations. 

For more info, read the FAQ, "Can I dump resin down the drain or flush it?

Emergency Contact Info

In the case of an emergency, contact the Safety Department in your region: 

    • North America: Arvato Bertelsmann 1-800-535-5053
    • Europe: Arvato Bertelsmann 1-352-323-3500


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