Re: 3d printer news

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andrew Werby <andrew@...>
wrote:

>
> 1b. Re: 3d printer news
> Posted by: "afogassa" afogassa@... afogassa
> Date: Wed Apr 9, 2008 4:38 pm ((PDT))
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Ron Ginger <ronginger@>
> wrote:
>
> > >
> > > >The parts Resolution depends on the powder you're using,

dental

> >
> >> > > plaster works best.there is a magic binder that I mix with

the

> >> > > plaster to hold it togheter, and I'm using just water on

the

> >>
> printer
>
> >> > > cartridge.
> >> > >
> >>
> > >
> > > Are you willing to say what this 'magic' stuff is? For me

thats

> >
> the
>
> > > whole issue, the mechanics to spread powder and the movement

of a

> >
> print
>
> > > head are pretty simple, but unless you can figure out the

magic

> >
> powder
>
> > > its all useless.
> > >
> > > ron ginger
> > >
> >
> All that I can tell is that it comes from Colombia, it's white
> and you can eat it if you want.
>
> [That would explain why that plaster's so &$#$@$%! expensive, when

you buy it from Z-corp...]

>
> WOAAAA hold on, it's not what you
> think :)
>
> It's maltodextrin, I just mix about 10 to 15% to Plaster.
> too much and it makes a big mess, glues everything,including the
> rails ,print head , feeding bin etc.....
> also, if you add too much of it, the plaster starts to curl when
> printed,and the parts will look like a surf board.
> it works very well at 600 dpi, but i guess it depends on the
> printer head, some have bigger ink drops then others.
> I'm happy with lexmark,it has a big black ink cartridge (30ML)so

I

> can print a Porsche model that's about 5x5x2 inches and a layer
> thickness of 0.004" and still have ink left for another part

before

> refill it.
>
> [Dextrin has been used for a long time to strengthen plaster,

although it sounds like you're using more than is typically
recommended. I'm not sure what's in dental plaster that makes it
special; could it be just regular plaster of Paris put up in small
cans? Or is something added? I'm used to buying plaster in 100 lb
bags; those are still a lot cheaper than the little buckets
of "magic powder" that Z-corp supplies. Do you infuse your models
with anything, like wax, epoxy, or CA?]

>
> Andrew Werby
> www.computersculpture.com
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

The dental plaster spreads out much better then regular plaster,I
do need to infuse(seal) the models with C.A otherwise it absorbs the
humidity and looks like rubber in a couple of days.
the Zcorp stuff is much better to spread it out but they only sell
it if you have A Zcorp printer.
I wish i could buy the Zcorp plaster to try it out.