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Powder?

Posted by cozmicray 
Powder?
August 09, 2015 10:33AM
Where do you guys get small quantity of PLA or ABS powder
without buying a ton of material?

confused smiley
Re: Powder?
August 31, 2015 02:53PM
I think the common material for SLS is nylon. Does ABS / PLA even work / is available?

AFAIK this place helped the you-sls project out with a reasonable price for a small order of glass filled white nylon 12:
[www.rpsupport.co.uk]
Re: Powder?
August 31, 2015 03:57PM
I'm using granulated sugar as my powder - it's much more IR absorbent than you'd think!

I'm using a variation of the High Speed Sintering process in BrundleFab, but using granulated sugar instead of nylon as the powder, and using black inkjet ink instead of pure carbon black.

Fine powdered sugar is actually more IR reflective than granular, in my experiments - you might want to use granulated in a 'classic' laser-based SLS.

When dealing with it, be sure to clean up any caramel that may form in your experiments. The caramel is much more hydroscopic than the granulated sugar, and goes from hard and brittle to a gooey mess in about a day.

If not sugar, if you are 'binder jetting', you can usually get away with some variant of plaster powder and rice wine or vodka.

If you are laser sintering - can't help you there. Nylon and sugar are the only materials I'm familiar with.
Re: Powder?
August 31, 2015 04:16PM
Well sand apparently works too. But beware: It's coarse and rough and irritating and it gets everywhere.
Re: Powder?
November 17, 2015 06:08AM
Hello All,

New to this thread, we make a fine PMMA (Acrylic) powder which we can supply in smaller quantities. I have a 45 micron media size, an 85 micron or 140 micron ex stock. Also can offer PA6 copolymer with PE 90/10) in a sub 100 micron powder which we can regrade to tighter fractions if there is some volume.

Get in touch if you need some assistance info@aksechemicals.com
Re: Powder?
November 17, 2015 06:50PM
Can PMMA be sintered?
Laser sintered?
What wavelength? Power?

Tnx
confused smiley
Re: Powder?
November 17, 2015 09:26PM
Yeah I'd be curious about that too. I figure it is transparent for visible light. Is it opaque in infrared or ultraviolet?

The PA6 is basically polyamide.

Thanks for posting aksechems if the 3D laser sintering ever gets off the ground we need companies that supply small quantities to makers.
VDX
Re: Powder?
November 18, 2015 06:26AM
... you'll need a CO2-laser with 10640nm with >10 Watts, but PMMA could suffer with heavy warping, so a heated chamber is a must too ...


Viktor
TTN
Re: Powder?
December 17, 2016 11:16PM
Quote
VDX
... you'll need a CO2-laser with 10640nm with >10 Watts, but PMMA could suffer with heavy warping, so a heated chamber is a must too ...

How are you getting these numbers?
VDX
Re: Powder?
December 18, 2016 07:51AM
... I was referring to his
Quote

I figure it is transparent for visible light.


... if it's transparent for the human eye (not dyed or blended with carbon black), then you'll need a CO2-laser -- and 10Watts seems to be the smallest available types today ... when I've started my first tests with CO2 in 1989, my first CO2-laser was a "naked" tube with 1,5Watts, the next types were sealed RF CO2-lasers with 3Watts and 5Watts ... a more modern type last year was 30Watts ...

Dyed or black powder can be sintered, melted or even evaporated with a blue 2W-laserdiode ...


Viktor
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