FW: SLS glass duraform problems

From: TRAVIS BEHARA (Travis.Behara@trimarkhardware.com)
Date: Wed Jul 07 1999 - 22:53:12 EEST

-----Original Message-----
Sent: Wednesday, July 07, 1999 2:51 PM
To: 'Drew Brown'
Subject: RE: SLS glass duraform problems

We have had some issues with surface Finnish on parts. I am assuming that
you are referring to the rough texture caused by the Duraform GF breaking
down over time. After many "trial and error" approaches this is what I do.
After reaching a total "z" height of 40 inches. I sift in new Duraform GF
powder in a 2:1 ratio with the old. As long as I don't go to far over the 40
inch number before doing this I haven't had a problem.

  Travis E. Behara
  Rapid Prototyping Engineer
  Tri/Mark Hardware
  New Hampton, IA

-----Original Message-----
From: Drew Brown [mailto:dsbrown@conceptual-reality.com]
Sent: Wednesday, July 07, 1999 12:02 PM
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

Drew Brown
Conceptual Reality L.L.C.

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