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3D-Fuel Annealing Salt

3D-Fuel Annealing Salt

3D-Fuel Annealing Salt Powder™ comes in an 8" x 8" x 2" box with a bag full of salt powder in the box. (About 5 lbs.)

Why Use Salt Powder for Annealing?

During the process of annealing filament printed objects with hangover parts tend to lose their structure and wilt or melt causing destruction of the form and function of the part. This has long been a problem and many have tried to solve the issue. 

Previous Solution

Laying a part down on its back is one way to do this, but what if you have multiple geometries that still do not lay flat? Some have tried using sand to do the job. Submerging the part in sand will work. Just cover it and fill all the voids, process the part through the annealing process in an oven and let it cool. But then, you have to get the part off and try to remove the sand. Since the part can partially melt during this process, the sand tends to stick to the part and is hard to remove. Also, you can't very well rinse the part in the sink as you do not want sand down your drain or in your disposer. 

A Better Solution

By using a very fine Salt Powder or Salt Flour, you can perform the same process only there are multiple advantages over using sand or another substance:

  • The salt powder is very finely ground and does not make indentions on the surface of your print. In fact, it may help to smooth the sides.
  • Salt powder is inert, non-toxic, and biodegradable. You can simply remove your print, shake out the voids, then rinse the part in the sink to remove any remaining salt.
  • Salt will not break down during the heating process. Unless you add water, the salt will bake easily and not lose its size or shape. 
  • You can use it to salt your popcorn or pecans! Really! It's food-grade salt that can be used in everyday cooking as well. 

3D-Fuel Annealing Salt™ is an excellent choice for annealing parts with difficult geometries. Try a box today and see for yourself! 


Use a baking pan or other oven safe container larger than your part and fill it partially with 3D-Fuel Annealing Salt Powder. Lay your part(s) into the salt and be sure to pack any voids so that they maintain their shape. Then, cover the rest of the part until it is fully submerged in the salt. 

  1. Preheat the oven or toaster oven to 176-266F (80 - 130C) to promote increased crystallization and further improve the heat deflection temperature.
  2. Place your pan on a room temperature baking sheet.
  3. Place baking sheet with the pan on it into oven/toaster oven.
  4. Wait 30-60 minutes for annealing to complete
    (in order for the item to fully reach the temperature of the oven)
    1. You may find the print takes on a milky/matte/opaque color transformation.
  5. Turn the oven off.
  6. Wait for the oven to cool to room temperature before removing the pan.
  7. Remove the part from the cooled salt and shake out the voids, then rinse it under cool or warm water.

Category: 3D Fuel

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