RE: "Zero Wall Thickness" and RP Materials

From: Charles Overy (
Date: Fri Oct 03 2003 - 22:01:00 EEST


What do you expect to see at the 0 wall thickness. Do you want the model
printed with the minumum wall thickness acceptable for the machine or do you
want to see nothing?

If the walls come together and taper to 0 then you probably want the part to
reflect this. Most machines will then taper the build to a no existent
point that depends on the resolution of the machine and the skill of the
post processor among other things. If however, you have 0 wall thickness
but want the wall to show the wall as a min thickness build that is a
different matter that probably requires some sort of mesh manipulation.


> -----Original Message-----
> From: []On
> Behalf Of Jonathan Chertok
> Sent: Friday, October 03, 2003 9:38 AM
> To:
> Subject: "Zero Wall Thickness" and RP Materials
> List,
> Can anyone offer their experience with respect to RP model
> manufacture with
> "zero wall thickness"?
> I have a "self-intesecting" model which I produced in SLA about
> three years
> ago and it seems to have held up really well, despite the fact that the
> model comes to an "X" where there is simply two lines (is this
> what I should
> be calling "zero wall thickness"?). There is a little bit of "sag" below
> these areas where the model appears to have been oriented "down", however
> where these same geometries were oriented "up" the model was produced
> perfectly.
> I suppose gravity affects the models where there is geometry such as this?
> Should I expect SLA to perform better than ZCorp in this respect?
> i.e. could
> I get away with not offsetting a surface (and gaining some thickness) for
> SLA, whereas I should only send out an offset surface for ZCorp Plaster?
> Also, I believe Charles mentioned something about having the
> "bleed" on or
> off. And was wondering whether there are controls that would
> allow a machine
> operator to help such models along.
> Sincerely,
> Jonathan
> Universal Joint
> Full Service Design and Construction
> Jonathan Chertok. Principal
> Austin Texas [512] 407 9628
> Buildings + Digital Manufacturing
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