Search found 27 matches

by Zenon
Fri Mar 20, 2015 4:29 pm
Forum: Creation Workshop
Topic: Mask
Replies: 45
Views: 57414

Re: Mask

I made a picture to illustrate what a mask does:

Image

So the mask evens out brightness imperfections in the projector output.
by Zenon
Fri Mar 20, 2015 4:17 pm
Forum: 3d Prints
Topic: Top-Down Resing floating on salt water
Replies: 7
Views: 11343

Re: Top-Down Resing floating on salt water

The CtrlV Test print seems to be popular lately, at least I've seen it used a lot:
by Zenon
Fri Mar 20, 2015 4:04 pm
Forum: Resins
Topic: Castsolid resin With resin replacement
Replies: 1
Views: 5905

Re: Castsolid resin With resin replacement

You might be interested in the discussion about glycerin (maybe with added salt) as a (heavier) resin replacement over here:

Do you know the density of CastSolid?
by Zenon
Fri Mar 20, 2015 3:59 pm
Forum: General
Topic: Glycerin is the way to go for top-down
Replies: 19
Views: 23362

Re: Glycerin is the way to go for top-down

That is good news as it may be a liquid with the viscosity properties of glycerin but with bigger density making the resin much more easy to separate. I am woried that having such a high density (2.66 is enormous) the salt will go to the bottom very fast. However since glycerin already is heavier t...
by Zenon
Fri Mar 20, 2015 8:49 am
Forum: General
Topic: Glycerin is the way to go for top-down
Replies: 19
Views: 23362

Re: Glycerin is the way to go for top-down

Glycerin in ecigs evaporates at around 180°C and it stays put for a long time, at least that's been my experience concerning e-cig glycerin (I used some glycerin as lubricant for a electrical razor once when I didn't have WD40 handy, and that was just a couple of drops and lasted about a month). The...
by Zenon
Fri Mar 20, 2015 5:46 am
Forum: General
Topic: Glycerin is the way to go for top-down
Replies: 19
Views: 23362

Re: Glycerin is the way to go for top-down

Do you plant to use epson salt in water ? Yes water, it was mainly to make a the difference between the resin and the water bigger int erms of density. Something else a chemist friend of mine suggested was wax, either liquid wax or maybe melted wax, since it melts at 46-68°C, so it should be feasib...
by Zenon
Thu Mar 19, 2015 6:06 pm
Forum: General
Topic: Glycerin is the way to go for top-down
Replies: 19
Views: 23362

Re: Glycerin is the way to go for top-down

Nice idea. I have a lot of glycerin left from my e-cig, so I'll give it a try once I finish my top-down printer. Another thing I'll be experimenting with this weekend is magnesium sulfate/Epsom salt, which is heaver in solution than saltwater (1.4g/cm^3 vs. 1.2g/cm^3). Already bought the sulfate and...
by Zenon
Thu Mar 19, 2015 5:29 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 293448

Re: Carbon 3D

That makes sense, I completely forgot about UV light creating free radicals as well.
by Zenon
Thu Mar 19, 2015 4:59 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 293448

Re: Carbon 3D

So the oxygen decays into free radicals, but those still hang around (basically oxygen molecules with an extra electron, if I remember my chemistry correctly). I wonder what effect those have on the resin, since free radicals are usually highly reactive, or what effect the loss of an electron has on...
by Zenon
Thu Mar 19, 2015 2:57 pm
Forum: Commerical Machines
Topic: Carbon 3D
Replies: 243
Views: 293448

Re: Carbon 3D

Their patent talks about a gradient of oxygen in the resin a lot, so that's where I'm getting the idea that it actually dissolves in the resin. So maybe I'm reading it wrong, but the patent doesn't make it sound as if it's merely the resin floating on top of a layer of oxygen. And the flow of resin ...