Search found 33 matches

by crusoe
Mon Mar 23, 2015 12:41 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

30mm in six minutes? Welp this just confirms its possible. Time to buy a fish tank!

Also looking into dual photon photopolymerization. :)
by crusoe
Mon Mar 23, 2015 12:42 am
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

I don't think TPX is that good.

Doing some unit analysis, its O2 perm is about 0.00014 Barrer.

Sipuran is 550 Barrer, and Teflon AF is 990 Barrer for O2.
by crusoe
Sat Mar 21, 2015 11:38 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

You don't care if its in focus at the surface because the surface cure is retarded due to O2 inhibition. The layer is approximately 150 microns thick, and does vary by light flux, O2 conc, and photoinitiator type. So there is some maximum light intensity you can't got above because otherwise the O2 ...
by crusoe
Fri Mar 20, 2015 4:20 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

If you are doing a top down vat, the resin at the surface is inhibited from curing by the presence of Oxygen (per CLIP/Carbn3D). So if you focus just underneath that layer, you would avoid defects caused by miniscus, and gain the benefits of the Carbon3D "CLIP" method. get a fish tank and ...
by crusoe
Fri Mar 20, 2015 1:05 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

Well tell them to focus their projectors at just below the surface and they can get this CLIP effect for free. ;)

I just dislike immersion printers because your build volume requires a LOT of resin.
by crusoe
Thu Mar 19, 2015 3:14 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

The biggest problem with floating resin on saturated salt water is miniscus effects and diffraction of light at the interface. You see all kinds of surface roughness on most top-down submersion style builds. Also, you can't empty the vat back into the bottle, and exposure to air/moisture shortens th...
by crusoe
Thu Mar 19, 2015 12:11 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

So the only concern I have is that eventually resin tends to cloud silicone coatings like DPMS. But it seems to be super stretchy, so while it may stretch, it should return to shape very easily. Silpuran is a silicone film, so we might be able to use a cheaper non-medical supplier. They are also ver...
by crusoe
Wed Mar 18, 2015 12:24 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

Of course, you could neutralize it first by soaking in a strong base. Then what is left over would be a very weakly basic film.

CRUD, I misread somewhere. Nafion is only about 1 barrers.
by crusoe
Wed Mar 18, 2015 12:23 pm
Forum: 3d Prints
Topic: My Printer in Actione - inc Flexvat
Replies: 44
Views: 53001

Re: My Printer in Actione - inc Flexvat

Except the b9 creator wasn't using the oxygen inhibition effect to speed printing. Thats the trick.
by crusoe
Wed Mar 18, 2015 12:17 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 279695

Re: Carbon 3D

http://www.nafionstore.com/NAFION_Products_s/6.htm

Nafion is also very gas porous, but may cause reactions in the resin due to sulfonic acid groups.