Tungsten filament, about how many meters in 1kg spool?
 
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Bruce Labitt
(@bruce-labitt)
Eminent Member
Tungsten filament, about how many meters in 1kg spool?

I'm trying to understand cost for making something using the 75% tungsten by weight filament.  I can't find anywhere how many meters per kg there would be in a spool.  Could someone help me out with this?  On the product page, it does not have this information.  Due to the weight of tungsten, there will be a lot less meters per spool, and this is understandable.  However, it would be useful for cost estimation, to know how many meters are on a spool, so using the slicer I can get a cost estimate per print.

Posted : 18/03/2023 10:30 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Tungsten filament, about how many meters in 1kg spool?

in the technical datasheet it says that the density is 4gm/cm3

which I estimate  equates to 104metres of filament in a 1kg roll

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 19/03/2023 12:30 am
Bruce Labitt
(@bruce-labitt)
Eminent Member
Topic starter answered:
RE: Tungsten filament, about how many meters in 1kg spool?

Thanks for your estimate.  I ended up calculating it myself from the density you gave and came up with a similar number - 103.94 m, close enough to 104 m.

For some reason, my math brain wasn't working the other day.  Got it working today 🙂

Posted : 19/03/2023 7:31 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Tungsten filament, about how many meters in 1kg spool?

I don't have decimal fingers and toes.... everyone in the close was needed to calculate 104, as it was...      they didn't mind full digits, but they declined to go to two decimal places...  
regards Joan

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 19/03/2023 8:13 pm
Stefan
(@stefan-3)
Estimable Member
RE: Tungsten filament, about how many meters in 1kg spool?

Had not heard of this stuff before, but now found that it is a new super special PRUSAMENT for radiation shielding 😀 

Does it enable me to build my own small personal nuclear reactor 🤣 ?

https://blog.prusa3d.com/were-launching-a-brand-new-prusament-petg-tungsten-75-for-radiation-shielding-use_75919/

Posted : 20/03/2023 6:27 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Tungsten filament, about how many meters in 1kg spool?

No, but it may stop your tungsten prints being irradiated when you do build a reactor

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 20/03/2023 10:01 pm
jsw
 jsw
(@jsw)
Famed Member
RE:

Pardon me for semi-hijacking this thread, but has Prusa done any studies on the conductivity of this filament?

I know there are a few so-called conductive filaments out there which are not really conductive enough for doing such things as circuit board traces, and there is one very conductive one which is obscenely priced.

I know that tungsten is not as conductive as copper or alumin(i)um, but I'm wondering if a filament that is metallically dense enough to block radiation might be conductive enough for some practical projects.

Posted : 21/03/2023 4:32 am
John
 John
(@john-6)
Reputable Member
RE: Tungsten filament, about how many meters in 1kg spool?

The Prusa blog says 100 metres

i3 Mk3 [aug 2018] upgrade>>> i3MK3/S+[Dec 2023]

Posted : 21/03/2023 8:58 am
karl-herbert
(@karl-herbert)
Illustrious Member
RE:
"Tungsten filament, about how many meters in 1kg spool?

I'm trying to understand cost for making something using the 75% tungsten by weight filament.  I can't find anywhere how many meters per kg there would be in a spool.  Could someone help me out with this?  On the product page, it does not have this information.  Due to the weight of tungsten, there will be a lot less meters per spool, and this is understandable.  However, it would be useful for cost estimation, to know how many meters are on a spool, so using the slicer I can get a cost estimate per print."

 

If the specific weight of the filament is known (see manufacturer's page), the weight and volume can be used to calculate the length of the spool e.g.:

specific weight (PLA) = 1.3 g/cm³

filament diameter = 1.75mm

spool net weight = 1000 grams

spoollength = 1000 g   /  0.0013 g/mm³  /  (1.75mm * 1.75mm * 3.14159 / 4) =  319846mm = approx. 320 meters

wbr,

Karl

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.

Posted : 21/03/2023 10:23 am
Stefan
(@stefan-3)
Estimable Member
RE: Tungsten filament, about how many meters in 1kg spool?

has Prusa done any studies on the conductivity of this filament?

it will not work as a conductor.

It consists of approx. 40 ccm Tungsten by volume and 200 ccm PETG by volume. So one can expect that the metallic particles do not touch themselves and thus no conductivity.

Posted : 21/03/2023 6:25 pm
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