RE: SLS glass duraform problems

Date: Fri Jul 09 1999 - 16:00:17 EEST

--- Received from NEWHOLLA.WSWANK 717-355-1146 99-07-09 08.00

  -> JIM(A)
  -> rp-ml(A)

We have been sucessfully running Duraform since it's release. Every now
and than, we get a very rough surface finish. We have determined that
part orientation and geometry are the major causes. As for Duraform GF,
it has not worked for us at all. Parts keep bowing downward. We are
not sure why. Any ideas?

Following up on the material cost discussion, has anyone received a
satisfactory answer as to why Duraform and Duraform GF are so expensive?

I personally feel that it is inconsistent with DTM's other material

PS: Does anyone have the details on the SLS Users group meeting in San
Diego? Please let me know. Thank you in advance.

Will Swank, Project Engineer
New Holland North America, Inc.

Date: Thu, 8 Jul 1999 18:24:10 -0400
Subject: RE: SLS glass duraform problems

Paramount recently had surface finish problems with Duraform (non-GF) in
our 2500plus. Running the same material in our 2000 we had no problems.
DTM said at first it may be the batch. Later they thought it was the mix
of cut vs. virgin. We had been adding 25% virgin. They advised 33%.
We received new material and processed it in our 2500+ and the surface
finish was beautiful. In final analysis it seems the heating system in
the 2500+ is proving to be less forgiving then the 2000.

As far as Drew's comment about what we were told when Duraform was
introduced, I concur. We were told it was completely recyclable. At
$60 per pound or 2x Fine Nylon, having to blend cut with virgin has
significantly increased our material costs over ProtoForm and Fine

Jim Williams, President and CEO
Paramount Industries
Rapid Product Development & Manufacturing Specialists
2475 Big Oak Road
Langhorne, PA 19047
215.757.9611 voice x229
215.757.9784 fax
888.RPTOOLS toll free * watch for our new page (really really soon!) * request company sales information * digital data transfer

-----Original Message-----
Sent: Wednesday, July 07, 1999 3:56 PM
Subject: RE: SLS glass duraform problems

We have had some issues with surface Finnish on parts. I am assuming
you are referring to the rough texture caused by the Duraform GF
down over time. After many "trial and error" approaches this is what I
After reaching a total "z" height of 40 inches. I sift in new Duraform
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 []
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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