Re: Humidity and SL5170/5180

From: Jim Harrison (Cutler Technologies)
To: Frost Prioleau (Plynetics  Express Corporation)
Cc: RP-ML
Date: Tuesday, October 11, 1994
Subject: Re: Humidity and SL5170/5180
On Thu, 6 Oct 1994, Frost wrote:
> What effects are people seeing from humidity on solid SLA parts built with 
> ACES or Wide-Weave building styles? Warpage? Surface tackiness? Dimensional 
> instability?

The sensitivity of the resin that I have seen is scary!  A part that was 
built in march of 94 was placed in a bucket of water for 2 hours.  The 
results was a very flexible part.  I could twist and bend it without 
breaking it.  This same part was built using aces build style and cured 
for 30 minutes.  Also, I have been told by others that this is how their 
parts come out of the vat.  I have only noticed the tackiness and once 
the support structure was rubbery.  I do know that 3D Systems has had to 
swap out vats, (not sure how many), due to this problem.  I have not 
noticed any of the other mentioned problems.

Jim Harrison
Cutler Technologies