Re: [CAD_CAM_EDM_DRO] REPRAP COST EFFECTIVE?

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-- note Skeinforge does not know the acceleration of your
machine, so the runtime (and therefore machine time) is typically lower than
the actual time, so I increased each by 50% to give more accurate numbers.
If the holes are from the side, it is actually slightly faster to print,
which is nice since the holes from the end would add to the
cost significantly with any other common manufacturing method.

This assumes you are printing .5mm layers at .9mm extrusion width. which is
larger than most people would want for hobby use, but for purely functional
parts is quite reasonable. It also assume you are printing at 100mm/sec,
which is not terribly difficult to achieve, and many
people print considerably higher than that on a standard RepRap. Machine
time cost is valued at $25/hour and material cost is at $25kg (that should
actually be a bit higher, probably $35.kg, but considering the low material
cost for the part the difference is basically irrelevant).

It really depends on how many you need to know whether this is cost
effective, but it is certainly possible that it would be. The other thing to
consider-- you won't just make this one part. Once you have a 3d printer,
you suddenly start finding all sorts of interesting parts you can make with
it, so you will probably justify the cost pretty quickly.

Holes through face:
Cost
Machine time cost is 3.49$.
Material cost is 0.39$.
Total cost is 3.89$.

Extent
X axis extrusion starts at 54 mm and ends at 106 mm, for a width of 52 mm.
Y axis extrusion starts at 43 mm and ends at 117 mm, for a depth of 74 mm.
Z axis extrusion starts at 0 mm and ends at 13 mm, for a height of 12 mm.

Extruder
Build time is 10 minutes 29 seconds.
Distance extruded is 47765.2 mm.
Distance traveled is 56670.5 mm.
Extruder was extruding 84.3 percent of the time.
Extruder was toggled 978 times.
Operating flow rate is 30.7 mm3/s.
Feed rate average is 90.1 mm/s, (5407.4 mm/min).

Filament
Cross section area is 0.31 mm2.
Extrusion diameter is 0.63 mm.
Extrusion fill density ratio is 0.68

Material
Mass extruded is 15.8 grams.
Volume extruded is 14.7 cc.

Meta
Text has 23130 lines and a size of 817.0 KB.
Version is SFACT_V2.0

Procedures
carve
bottom
preface
inset
fill
multiply
speed
raft
skirt
chamber
comb
cool
dimension

Profile
1.7mm-0.5 nozzle

Slice
Layer thickness is 0.5 mm.
Perimeter width is 0.9 mm.




Holes from sides:

Cost
Machine time cost is 3.28$.
Material cost is 0.41$.
Total cost is 3.68$.

Extent
X axis extrusion starts at 54 mm and ends at 106 mm, for a width of 52 mm.
Y axis extrusion starts at 43 mm and ends at 117 mm, for a depth of 74 mm.
Z axis extrusion starts at 0 mm and ends at 13 mm, for a height of 12 mm.

Extruder
Build time is 9 minutes 50 seconds.
Distance extruded is 49204.9 mm.
Distance traveled is 52840.7 mm.
Extruder was extruding 93.1 percent of the time.
Extruder was toggled 554 times.
Operating flow rate is 30.7 mm3/s.
Feed rate average is 89.6 mm/s, (5374.5 mm/min).

Filament
Cross section area is 0.31 mm2.
Extrusion diameter is 0.63 mm.
Extrusion fill density ratio is 0.68

Material
Mass extruded is 16.2 grams.
Volume extruded is 15.1 cc.

Meta
Text has 12145 lines and a size of 416.0 KB.
Version is SFACT_V2.0

Procedures
carve
bottom
preface
inset
fill
multiply
speed
raft
skirt
chamber
comb
cool
dimension

Profile
1.7mm-0.5 nozzle

Slice
Layer thickness is 0.5 mm.
Perimeter width is 0.9 mm.

On Sun, Oct 9, 2011 at 5:42 AM, 556RECON <556recon@...> wrote:

> I love gadgets and stuff like this machine. and I want one. but I have
> to know how much I would use it an if it would be cost effective.
>
> An example: A part I make for a company is a spacer. It is 0.500"
> thick, 1.625" by 2.500". there is 1.125" hole centered on the piece and
> 2 0.1875" holes one on each end. They cannot be wood or metal so that
> means plastic.
>
> Can any one give me an idea of what the cost of materials and time to
> make the parts.
>
> I realize that the faster the machine is the more they cost.
>
> I have a prototype probotix V90with a 8.5" X 12" XY axis and 3" Z axis
> OR a Sherline CNC milling machine that I could probably convert.
>
> How fast could the part be made and how expensive is the material.
>
> I would love to justify building one.
>
> OR
>
> Can some one suggest a better group to ask this kind of question?
>
> BOB
>
>
> Ron Thompson wrote:
> >
> >
> > The price is coming down, due mostly to lower part count designs and
> > Arduino based electronics.
> > And print quality is improving due to better software and smaller
> > extrude size. The more people who get involved, the faster the
> > improvements.
> >
> >
>
>
>
> ------------------------------------
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