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Yeah I think I'll still continue to use salt water too.
The results are better.
Nice build to
Statistics: Posted by odino — Sun Mar 29, 2015 1:15 pm
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Resin used is FunToDo standard.
From left to right we have sugar water (about 100g of powdered sugar applied to 2dl of water, might want to give lower concentrations a true in the future), glycerin, table salt water, Epsom salt water, and regular water all the way on the right (just to catch drops from the spoon).
The links below the images are to bigger version. We didn't have the best camera on hand, so the pictures aren't great.
Everything settled:
Pictures directly after stirring:
15 minutes later:
Some impressions:
Sugar water: By far the worst, takes ages to separate and while I'm not sure if the gradient that forms is just pigment or tiny droplets of resin, I wouldn't recommend it. A little more vibration dampening than the water mixtures, a little less than Glycerin.
Glycerin: Initial separation is fairly quick, but you're left with a glycerin-resin boundary that's cloudy/has lots of little resin streaks going into the glycerin that take a long time to settle. Best vibration dampening.
Table salt: works nicely, fast and clear separation, only takes about 5-10 seconds to fully separate. Worst vibration dampening.
Epsom salt: Not sure what to make of this. Separation is fast, slightly faster than Table salt, and you get a really nice layer separation. But the water is left with a faint red color, which might be pigment. I couldn't make out individual resin droplets in it, so I have no clue what it is. Might also be small amounts of resin sticking to small salt crystals and "floating in mid-water". Same vibration dampening as water.
For now, I think I'm sticking with salt water, the difference to epsom salt is marginal at best and table salt is cheaper and easier to get.
We'll let the sample stay still for some weeks to see how they fair longterm.
And in case anyone is interested, the printer so far: . Already got the z-axis working with the arduino, so all that's left to do is adding a shutter, hooking everything up and calibrating. Hopefully we'll get our first prints next weekend.
Statistics: Posted by Zenon — Sun Mar 29, 2015 10:02 am
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Concerning glycerin, when mixing ecig juice, I usually heat it up by running hot tap water (~70°C) over it before shaking, that makes a huge difference in viscosity. So you might want to experiment with heating the glycerin up, maybe for the whole print duration or just in the beginning to help it separate from the resin.
Statistics: Posted by Zenon — Mon Mar 23, 2015 11:59 am
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I want to keep trying with glycerin and with sugar+water.
In the next days I'll make some test I think (water+sugar)
Statistics: Posted by odino — Mon Mar 23, 2015 8:11 am
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After that there were little bubbles of resin floating in the glycerin. Because they were very small they did not have enough power in them to beat the viscosity and move tot the top. Probably after a couple of hour whould have been ok but...
Statistics: Posted by aurelm — Sat Mar 21, 2015 10:24 am
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Ps: I bought 99.5% purity glicerin from a local store in my city. It is labeled "reactive glycerin for analysis"
Statistics: Posted by aurelm — Sat Mar 21, 2015 7:12 am
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The wax thing was something he mentioned in passing yesterday evening, so I haven't really given it much thought and haven't asked him about any specifics so far. There's a lot of different type of waxes (not only paraffin), so I'm not sure what kind he was talking about. The wax in lava lamps is heavier than water unless it is heated, so maybe it's something like that.
I'll check tomorrow how much Epsom salt can be dissolved in Glycerin and let you guys know. I found a table with the solubility of different salt in Glycerin, though that doesn't list Epsom salt (found here: ). Some sources mention it being partially soluble in Glycerin, but not how much of it is actually soluble. Those two things seems to indicate that Epsom salt should dissolve reasonably well in Glycerin.
Statistics: Posted by Zenon — Fri Mar 20, 2015 8:49 am
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