Re: [CAD_CAM_EDM_DRO] REPRAP COST EFFECTIVE?

Sorry, I meant to specify that. No, this part was sliced using 3 solid
layers at the top and bottom, 3 shells around the sides and all holes, and a
35% fill ratio for the rest of the part. That is plenty strong for most
parts, in fact most people only use 2 shells and surface layers, and many
use a 20-25% fill ratio, but I prefer my parts to be a bit more robust, and
for a spacer these are probably good settings. Short of hitting it with a
hammer, most people would not be able to break the resulting part.

On Sun, Oct 9, 2011 at 1:08 PM, Ron Thompson <ron@...> wrote:

> On 10/9/2011 3:40 PM, Mike Payson wrote:
> > Rather than guessing, I made up a simple model of the part you specify, a
> > block 1.625x2.5, a 1.125" hole in the center and two .1875" holes
> > on opposite ends. It was not clear from your description whether the
> > .1875"
> > holes were through the face of the material or from the ends to the
> > center.
> > I made the model both ways, then processed them with Skeinforge (the
> > toolpathing software the RepRap uses).
> >
> > The full output of each run is pasted below, is pasted below, but the
> gist
> > of it is that these parts will cost about $5.25 each and take about 15
> > minutes to run--
>
> Mike,
> I assume this is solid, yes? So if the part can be lightened, the cost
> can be reduced.
>
> I also noticed you left out some significant things in the quote. Setup,
> cleanup (machine/work area), deburring, handling for shipping..just to
> name a few off the top of my head.
> As these are not commercial quality machines, it is reasonable to figure
> life expectancy and replacement cost.
>
> If you think this is nit picking or irrelevant, you won't be in business
> long.
>
> Also note, if anyone is using this to justify a machine build or buy,
> there is a learning curve before you get good parts.
>
> Of course, if you just want one...<GRIN>
>
> --
>
>
> Ron Thompson
> On the Beautiful Florida Space Coast, right beside the Kennedy Space
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