RE: SLS glass duraform problems

From: Miller, Michael W (
Date: Wed Jul 07 1999 - 20:45:32 EEST

We have also had trouble with the regular duraform giving an orange peel finish when it gets too old. This problem was lightly addressed by DTM by saying that it isn't 100% recyclable after all and should be completely replaced every so often. Throwing out some of the part cake and replacing with fresh helps but does not cure. Our current solution since we have the luxury of 3 sinterstations is to run approx 10 builds with new powder in one (high quality) machine, then transfer the powder to the next (mid quality) machine for about 10 builds, then to the 3rd (low quality) machine for about 10 builds before trashing the remaining powder. I wish DTM would come up with a revitalizing tonic for that "root problem".

Michael W Miller (
The Boeing Company MS 17-PE B-XT62
Propulsion Experimental Hardware 206-655-3289
Rapid Prototyping 655-4366 Lab 655-4365

> ----------
> From: Drew Brown[]
> Sent: Wednesday, July 07, 1999 10:02 AM
> To: RPML
> Subject: SLS glass duraform problems
> I had sent out a note a few weeks back asking if anyone had been having
> any problems with running SLS glass duraform. We had been experiencing
> some very strange surface problems on our parts and found out that there
> were several others experiencing the same or similar problems at that
> time. DTM provided us with some short term material corrections but
> recently we have started to experience the same sort of problems again,
> but not to the magnitude as seen before. Is anyone out there finding
> that the duraform (glass or regular) is not anywhere near as recyclable
> as we were sold on it be? The nearly 50% material price increase over
> the old nylon materials is very difficult to stomach when we are finding
> that the old nylon products are more recyclable than the new duraform.
> Is anyone experiencing the same sort of build problems? If so please let
> me know what you've been told is the problem and if there have been any
> solutions. I'm interested in finding out the root problem and corrective
> action.
> Drew Brown
> Conceptual Reality L.L.C.
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