volume of weight
MockingBirdTheWizard
much looking forward to assembly and printing.
I am wondering if anyone has any information on the weight/volume
ratio of the printing plastics.
meaning, a 1 lbs spool of pcb would equate to approximately how many
cubic inches of printed volume?
I can't seem to find any stats on this.
I've been learning 123d as a 3d modeler. any suggestions on an easy
way create a filler matrix to support builds without wasting plastic
on 'filler'? maybe it's a common function, what the process is called
would be a great start. :-)
after it's printing 'normal', I'll be trying to hook up a second
extruder to print a filler material that can be washed away, allowing
the second 'normal' material to create more complex shapes.
thanks in advance for any information.
-Leonard
Jeff Keegan
Sent from my iPhone
On Jan 16, 2012, at 11:56 PM, MockingBirdTheWizard <mockingbir...@gmail.com> wrote:
> I have a 3d printer arriving in march (well, parts, anyway). very
> much looking forward to assembly and printing.
Congrats!
> I am wondering if anyone has any information on the weight/volume
> ratio of the printing plastics.
> meaning, a 1 lbs spool of pcb would equate to approximately how many
> cubic inches of printed volume?
> I can't seem to find any stats on this.
I think that info used to be (maybe still is?) output by slicing tools such as skeinforge when you slice. I remember there being info about cubic centimeters of volume for original Mendel parts.
> I've been learning 123d as a 3d modeler. any suggestions on an easy
> way create a filler matrix to support builds without wasting plastic
> on 'filler'? maybe it's a common function, what the process is called
> would be a great start. :-)
People typically just design a solid object (for example, a 32mm x 32mm x 32mm cube) and create an .stl file for it. Then they use a tool like skeinforge or slic3r (I've used skeinforge and the built-in slicer in RepRap Host) to convert the .stl file into a gcode file that has specific tool paths for your printer to follow (move to this xyz coordinate, start extruding, move to this coordinate, etc). That tool allows you to specify what sort of full you want inside the object. You can say 100% infill, or go with something else (default is 35% infill). The slicing tool will figure out an infill pattern to generate that 35% infill for you - you don't do that during design.
> after it's printing 'normal', I'll be trying to hook up a second
> extruder to print a filler material that can be washed away, allowing
> the second 'normal' material to create more complex shapes.
Keep that in mind on the horizon, but focus on getting it up and running first. It's much easier now but it used to take a long time to get working perfectly.
>
> thanks in advance for any information.
>
> -Leonard
No problem. Welcome aboard!
..Jeff
>
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Leo Dreyfus
I'll take a look into that software, it sounds like it solved those issues marvelously.
thanks again!
-Leonard
"Noli exulcero Leones"
-MB
"I celebrated Thanksgiving in an old-fashioned way. I invited everyone in my neighborhood to my house, we had an enormous feast, and then I killed them and took their land."
Ƹ̵̡Ӝ̵̨̄Ʒ
♪ (\__/) ♫
♫ (='.'=) ♪
(")_(")
Never interrupt your enemy when he is making a mistake. - Napoleon Bonaparte
Larry
> I have a 3d printer arriving in march (well, parts, anyway). very
> much looking forward to assembly and printing.
> I am wondering if anyone has any information on the weight/volume
> ratio of the printing plastics.
> meaning, a 1 lbs spool of pcb would equate to approximately how many
> cubic inches of printed volume?
Hello Leonard,
First off, I hope your 3-D printer parts arrive soon and in good
condition.
As to your query about "volume of weight"
Usually in English, this is termed "weight per volume" AKA density or
specific gravity.
Densities are usually given in grams per cubic centimeter (or in
imperial units -- shudder -- in pounds per cubic inch.)
Specific gravity is the ratio of the material's density to that of
water (at it's greatest density, 1 gram/cc at approx 4 degrees
Centigrade.)
Most (unfilled, unfoamed) plastics have specific gravities from just
above water to around 1.5.
Filled plastics (e.g. tire rubber or plastic filled with ground glass
{it's cheap}) may fall outside this range. I think most filled
plastics would clog a reprap extruder, unless the filler particles
were very small compared to the extrusion orifice -- and even then,
they're probably significantly more viscous, and would probably
overwork the extruder motor.
**** A great online resource for material properties is matweb.com
****
For instance, here's the density for one supplier's PLA plastic:
Specific Gravity 1.24 g/cc 1.24 g/cc
IMHO, matweb also has some nice search features, and covers metals,
ceramics, and even wood. Not bad, for free info.
Larry
----
P.S.: Here is a huge wad of additional material properties for that
brand of PLA, pasted in from a matweb query:
NatureWorks® Ingeo™ 2002D Extrusion Grade PLA
Categories: Polymer; Thermoplastic; Polylactic Acid (PLA) Biopolymer
Material Notes: NatureWorks® PLA polymer 2002D is a thermoplastic
resin derived from annually renewable resources and is specifically
designed for extrusion/thermoforming applications. PLA polymer 2002D
is a clear extrusion sheet grade and processes easily on conventional
extrusion and thermoforming equipment.
Potential applications for PLA polymer 2002D include: Dairy
containers; Food serviceware; Transparent food containers; Blister
packaging; Cold drink cups
Vendors: No vendors are listed for this material. Please click here if
you are a supplier and would like information on how to add your
listing to this material.
Printer friendly version Download as PDF Download to Excel
(requires Excel and Windows)
Export data to your CAD/FEA program Add to Folder:
Physical Properties Metric English Comments
Specific Gravity 1.24 g/cc 1.24 g/cc ASTM D792
Melt Flow 5.00 - 7.00 g/10 min
@Load 2.16 kg,
Temperature 210 °C 5.00 - 7.00 g/10 min
@Load 4.76 lb,
Temperature 410 °F ASTM D1238
Mechanical Properties Metric English Comments
Tensile Strength at Break 53.0 MPa 7690 psi ASTM D882
Tensile Strength, Yield 60.0 MPa 8700 psi ASTM D882
Elongation at Break 6.00 % 6.00 % ASTM D882
Tensile Modulus 3.45 GPa 500 ksi ASTM D882
Izod Impact, Notched 0.1281 J/cm 0.2400 ft-lb/in ASTM D256
Optical Properties Metric English Comments
Transmission, Visible 90.0 % 90.0 % Thickness Unknown
Processing Properties Metric English Comments
Feed Temperature 180 °C 356 °F
Adapter Temperature 200 °C 392 °F
Die Temperature 190 °C 374 °F
Melt Temperature 210 °C 410 °F
Drying Temperature 90.0 °C
@Time 2.00 hour 194 °F
@Time 2.00 hour
Moisture Content <= 0.0250 % <= 0.0250 %
Dew Point -40.0 °C -40.0 °F
Drying Air Flow Rate >= 14.2 l/min >= 0.500 ft³/min (CFM)
Screw Speed 20.0 - 100 rpm 20.0 - 100 rpm
----
mockingbir...@gmail.com
assuming a weight of 1.24grams/cubic centimeter
a 1 lbs spool of filament would produce roughly 20 cubic inches of solid print.
with a 30% fill lattice, the overall enclosed volume could be somewhere around 34 cubic inches.
(blatantly ignoring certain factors I can see would make a difference, but looking for some rough estimates)
maybe closer to 30 cubic inches in reality.
I was trying to figure out how much plastic to order, and what I might make from different amounts of it.
(also how lenient I can be on mistakes and how much each print would cost per volume used, etc).
I was reading somewhere about the different properties of the various plastics, shrinkage, smooth or rough finish, etc..
staying away from plastics that might warp/shrink, does anyone have any recommendations of what to get/where?
either by price "ie. it's super cheap here!" or by quality, "this stuff is more expensive but produces really great results"
my goals, not surprisingly, are prototyping ideas I've always had trouble re-creating in metal due to lack of tools. (and untrained shyness around metal lathes).
so I hope to produce rough sketches to work out issues, and a nice material I might be able to polish up with dremel polishing wheels or something similar that might be closer to a 'finished' product.
-Leo
On , Larry <urs...@gmail.com> wrote:
> On Jan 16, 11:56 pm, MockingBirdTheWizard
>
> mockingbirdthewiz...@gmail.com> wrote:
>
> > I have a 3d printer arriving in march (well, parts, anyway). very
>
> > much looking forward to assembly and printing.
>
> > I am wondering if anyone has any information on the weight/volume
>
> > ratio of the printing plastics.
>
> > meaning, a 1 lbs spool of pcb would equate to approximately how many
>
> > cubic inches of printed volume?
>
>
>
>
>
>
>
>
> Drying Air Flow Rate >= 14.2 l/min >= 0.500 ft³/min (CFM)
>
> Screw Speed 20.0 - 100 rpm 20.0 - 100 rpm
>
> ----
>
>
>
Larry
so, if I have my math right (always a questionable thing when I'm not using excel)
assuming a weight of 1.24grams/cubic centimeter
a 1 lbs spool of filament would produce roughly 20 cubic inches of solid print.
Jeff Keegan
Sent from my iPhone