If you look at our formulas and our strategy, you will see that we put the adhesive in the powder and the “binder” is, in fact, just a solvent. While each new powder that we attempt in our lab goes through a set of tests for adhesive/binder compatibility, we have had great success with the sugar/malto-dextrin/wheat-dextrin combination. Also, they are VERY low cost -> Bonus! Malto-dextrin/wheat-dextrin really dissolve well and really like water (they are considered hygroscopic).
Therefore, warning our powder/binder combination produce parts which are water soluble. In fact, a very small amount of water will cause the part to melt!
A brief demonstration:
Warm or Hot water is even worse. Since Seattle is a city of coffee, PLEASE be careful with your hot coffee or tea if you are in the vicinity of your parts.