I have a similar issue with parts that I've designed that have a couple of inches of .020" spaced surfaces that are intended to slide relative to one another. When I received the printed parts they were as if welded together. I soon realized that it was tightly compacted powder between the parts that was preventing them from moving. Compressed air didn't seem to have an affect. I was able to dislodge the powder using thin spring steel wire that I had on hand that is available from McMaster-Carr. I would like to find a better method such as the a fore mentioned freezing to help loosen up the powder as the finished parts will be in a more complex assembly that will be more difficult access. Any addition details about the freezing method would be appreciated.
Last edited: Feb 13, 2014