top down with resin floating on water or ???

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kakapoopie
Posts: 115
Joined: Sun Jun 15, 2014 8:49 am

Re: top down with resin floating on water or ???

Postby kakapoopie » Tue Aug 26, 2014 4:53 pm

hey guys..using plain salt water here with subG+ No problems so far. Kinda looks like a lava lamp when you pour it in

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bobbitay
Posts: 4
Joined: Sat Aug 23, 2014 3:03 pm
Location: Boise, Idaho

Re: top down with resin floating on water or ???

Postby bobbitay » Tue Sep 02, 2014 11:46 am

Thought I'd throw in my two cents as well since I've just started printing and I have a top down and I floated it on salt water, too. Just plain table salt is what I used with tap water. I heated it on the stove top to get it to dissolve as much as possible and then let it cool to room temperature and poured it into my vat avoiding pouring the remaining salt crystals that formed at the bottom after cooling. Then I poured in my resin on top. It floats very well. Sub G+ is the resin that I'm using for now.

My question is - are there any resins that may be too dense to float on top of the salt water? And how long has plain salt water lasted for anyone or do you make a new batch every printing session?

kakapoopie
Posts: 115
Joined: Sun Jun 15, 2014 8:49 am

Re: top down with resin floating on water or ???

Postby kakapoopie » Tue Sep 02, 2014 4:20 pm

bobbitay wrote:Thought I'd throw in my two cents as well since I've just started printing and I have a top down and I floated it on salt water, too. Just plain table salt is what I used with tap water. I heated it on the stove top to get it to dissolve as much as possible and then let it cool to room temperature and poured it into my vat avoiding pouring the remaining salt crystals that formed at the bottom after cooling. Then I poured in my resin on top. It floats very well. Sub G+ is the resin that I'm using for now.

My question is - are there any resins that may be too dense to float on top of the salt water? And how long has plain salt water lasted for anyone or do you make a new batch every printing session?


I've been using Funtodo Standard over salt water this week and it's working fine. Salt water hasnt stopped working yet..it's been about 2 weeks printing so far.

Phife
Posts: 239
Joined: Fri Jan 17, 2014 5:24 pm

Re: top down with resin floating on water or ???

Postby Phife » Tue Sep 02, 2014 5:31 pm

Ive been doing some experiments with floating resin. Heres some things ive found.

Ive had some FTD red resin and some SPOT-LV w/black dye resin floating on salt water for the last 2 weeks. I just left it there to see what would happen.

I used 30% salt to distilled water by weight and just mixed it in. After the two weeks I found a few salt crystals on the bottom of the tub. Not many, but I think 30% is about the maximum i could get to stay in solution. I dont see some salt crystals at the bottom affecting too much. no salt was in the resin.

I did some density tests, My FTD resin was 0.98g/ml, Spot-lv was 0.95g/ml, distilled water was 1g/ml and salt water was 1.15g/ml. Both resins floated easily on the salt water, but mixed a little on just water.

I found that some of the edges of the FTD resin started to cure after being left out for 2 weeks, a little less with the spot-lv, I just had them out in the room. They werent getting direct light but were exposed to some indirect light.

The FTD resin and pigment had separated a little, it was noticeably lighter on the top of the resin. I didnt see any change in the Spot-lv with dye.

I took both tubs outside and exposed them to sunlight and they got extremely hot, nearly started to boil the water! after dumping out the water I let it sit and sizzle for a a couple minutes.. The reactions are very hot! be careful!

waleedq
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Joined: Thu Aug 27, 2015 5:03 am

Re: top down with resin floating on water or ???

Postby waleedq » Thu Sep 03, 2015 4:09 am

This floating method is amazing,
But i have one question that have just floated up, would the salt water cause the cured resin parts to float to the surface?? would it force the object to get off the build surface due to density differences? if so this method will still fail with large objects

hefeglass
Posts: 13
Joined: Sun Aug 23, 2015 1:02 pm

Re: top down with resin floating on water or ???

Postby hefeglass » Thu Sep 03, 2015 1:29 pm

^i havent had any issues with this yet...as long as the object is adhered properly to a perforated build plate it should stay put

newraper1963
Posts: 10
Joined: Mon Jan 19, 2015 6:55 pm

Re: top down with resin floating on water or ???

Postby newraper1963 » Thu Sep 03, 2015 2:16 pm

I've been using this method since last Christmas without any issue. I have printed with all the Fun To Do resins except Snow White with no problems. I've even had the build plate go below the resin and into the salt water while printing. No problem. As stated, just made sure the print is attached well to the build plate. As an add on, I print parts for my model cars almost every day.

fponticelli
Posts: 3
Joined: Sat Dec 27, 2014 8:00 pm

Re: top down with resin floating on water or ???

Postby fponticelli » Mon Nov 23, 2015 1:11 pm

Has anyone tried with glycerin?

I did and it was a disaster. But I think the main problem was that I was trying to print bottom-up. The liquid are very clearly separated and glycerin is extremely dense. I bet it would work fine with a top-down.

Now I really need to think if I should redesign my machine to be top-down :(

Fridolin
Posts: 11
Joined: Sun Jul 12, 2015 6:00 am

Re: top down with resin floating on water or ???

Postby Fridolin » Wed Nov 25, 2015 4:16 pm

fponticelli wrote:Has anyone tried with glycerin?

I did a test print on a top down machine floating Makerjuice G+ on glycerol. I couldn't see any problem with it during printing.
However I am having problems with pigments settling and forming a 3rd layer between resin and glycerol when left for a while. Trying to mix the pigment into the resin results in mixing resin and glycerol and if I wait for them to seperate I end up with 3 layers again. I opened a thread for this problem over there: viewtopic.php?f=11&t=3332
Otherwise it worked just fine for me.

FR3Dprint
Posts: 19
Joined: Tue Dec 16, 2014 4:20 pm

Re: top down with resin floating on water or ???

Postby FR3Dprint » Fri Nov 27, 2015 8:28 am

Hi Fridolin,

I'd already experienced this issue, when printing with salt water, but with a major difference. I use FunToDo resin, which needs many hours to the pigments to go down. The snow white resin "loose" pgmentation faster than lack or red ftd resin. Nevertheless, I successfully print object that takes around 10hrs, without any problem. The pigments form a 3rd layer, only the day after. For red resins, I think this takes more time.