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by jbin
Fri Jun 03, 2016 1:32 pm
Forum: Troubleshooting
Topic: Help, Lost communications with B9
Replies: 3
Views: 914

Re: Help, Lost communications with B9

Ok, now I feel like a complete idiot. It would not talk because it wanted me to update the Firmware. :oops:
by jbin
Thu Jun 02, 2016 10:42 pm
Forum: Troubleshooting
Topic: Help, Lost communications with B9
Replies: 3
Views: 914

Re: Help, Lost communications with B9

Thanks Mike, I'll get the screen shot in the morning.
by jbin
Thu Jun 02, 2016 6:09 pm
Forum: Troubleshooting
Topic: Help, Lost communications with B9
Replies: 3
Views: 914

Help, Lost communications with B9

I seem to be unable to communicate with my B9 1.2. It worked fine the last time I used it but now I cannot get the computer to see the printer. The cable is good, I tested it on a seperate Arduino board and I can talk to it. The B9 seems to be working I can run the table up and down and the vat from...
by jbin
Wed May 18, 2016 11:47 pm
Forum: General
Topic: A New Method for Preparing 3D Acrylic Photopolymer Patterns for Investment Casting
Replies: 3
Views: 1493

A New Method for Preparing 3D Acrylic Photopolymer Patterns for Investment Casting

Here is a copy of a paper I just presented at the Santa Fe Symposium for Jewelry Manufacturing. The resin tests were done with Cherry.
by jbin
Thu Mar 31, 2016 5:10 pm
Forum: Tips & Tricks
Topic: Burnout - is it necessary to turn flask from down to up position?
Replies: 42
Views: 9041

Re: Burnout - is it necessary to turn flask from down to up position?

The resin remains fairly solid till it reaches between 300°C and 400°C (572°F-752°F) at that point it begins to decompose by unzipping the polymer chain. It actually returns to the monomer(liquid) state. Some of the liquid vaporizes and some actually re-polymerizes and returns to a solid form, It c...
by jbin
Wed Mar 30, 2016 12:37 pm
Forum: General Discussion
Topic: Some B9 Modifications
Replies: 26
Views: 5517

Re: Some B9 Modifications

It definitely made my prints look better.
by jbin
Tue Mar 29, 2016 2:06 pm
Forum: Tips & Tricks
Topic: Burnout - is it necessary to turn flask from down to up position?
Replies: 42
Views: 9041

Re: Burnout - is it necessary to turn flask from down to up position?

I don't think it stays in the liquid state very long based on images others have posted of the resin being heated in the kiln/oven. It pretty much stays relatively solid as it is vaporizing and burning off. The way the polymer decomposes inside the investment is actually quite different than just s...
by jbin
Tue Mar 29, 2016 1:51 pm
Forum: General Discussion
Topic: Some B9 Modifications
Replies: 26
Views: 5517

Re: Some B9 Modifications

I did some similar stiffening of my B9 with aluminum extrusions to insure co planar alignment. I also added a double hinge on the door to allow it to fold down all the way with the extrusion legs that were installed.
by jbin
Sat Mar 26, 2016 1:59 pm
Forum: 3D Printing
Topic: OLO3D printer lets you print with your smartphone
Replies: 6
Views: 1589

Re: OLO3D printer lets you print with your smartphone

It looks interesting enough that I became a supporter of the Kickstarter project.
by jbin
Tue Mar 08, 2016 8:47 pm
Forum: Tips & Tricks
Topic: Burnout - is it necessary to turn flask from down to up position?
Replies: 42
Views: 9041

Re: Burnout - is it necessary to turn flask from down to up position?

I think you are still better off burning out sprue opening down. At a minimum you want the wax of the sprues to flow out, leaving it to soak into the investment makes it much harder to get a clean burnout. This also applies to the liquids that form in the decomposition of the resin. I have been doin...
by jbin
Tue Mar 08, 2016 4:16 pm
Forum: Tips & Tricks
Topic: Back to the Oven mod +oven models
Replies: 38
Views: 6297

Re: Back to the Oven mod +oven models

I think we are doing this all wrong and fighting the forces of nature when it comes to Burning out resins. Tell me what you think. I think you are still better off burning out sprue opening down. At a minimum you want the wax of the sprues to flow out, leaving it to soak into the investment makes i...
by jbin
Mon Mar 07, 2016 9:26 pm
Forum: Tips & Tricks
Topic: Back to the Oven mod +oven models
Replies: 38
Views: 6297

Re: Back to the Oven mod +oven models

I modified my furnace with holes at the bottom of the door. I use an aquarium pump to flow air into the furnace. It really helps to speed burnout.
by jbin
Fri Feb 26, 2016 2:17 pm
Forum: Tips & Tricks
Topic: How could I cause porosity?
Replies: 10
Views: 1647

Re: How could I cause porosity?

lswatson wrote:Along that vein, has anyone discovered a solvent, acid or chemical that will melt a B9 1:1 mix print?

Otherwise, I will have to start work with displacement mapping, again. Which is great fun, but results in
a static model.


Methylene chloride
Laquer thinner
by jbin
Fri Feb 26, 2016 11:54 am
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

I have a theroy on the resin burning out and that is to achieve the highest temp ASAP to reach the burn rate. All the research I have been doing and my own experiments point to a long hold at low temperature to remove all the water and then a fast ramp up to your high end temperature. This is a sch...
by jbin
Wed Feb 24, 2016 8:46 pm
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

Hmm its after 420f or so that the resin starts to go from light color to a darker tone slight deform..and at 500 thin parts will start to warp. I have yet to see patterns deform at 300f..b9 resin cherry and emerald ..others i cannot say. So I need to thank you. You got me wondering. I have set up m...
by jbin
Wed Feb 24, 2016 6:41 pm
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

I am thinking that after wash off, heat print to 250 then put vacuum in mineral oil heated to 220. I have never pulled 29" plus of vacumem with hot oil but I am game. Thanks for all your posts and info. Regards Franz Do not vacuum mineral oil hot or otherwise. It will boil and evaporate ruinin...
by jbin
Tue Feb 23, 2016 8:36 pm
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

Seriously, clean with water and detergent. Heat in oven at 200F for 1hr-2hr. That will give a very reasonable cure.

At 350F you are beginning to break down the resin, there are visible physical changes to the pattern from that high a temperature.
by jbin
Tue Feb 23, 2016 10:46 am
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

And as a result I had not cast them right away, matter of fact they sat on my wax bench for probably 3 weeks after being printed. then when I was going to cast silver I put them in the oven to cure them and the cracked all over and split along the sides vertically. So are you saying that leaving th...
by jbin
Mon Feb 22, 2016 3:26 pm
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

DIY vacuum oven. Basically a double boiler with a vacuum tight inner pan. This keeps the temperature down to a reasonable level and provides uniform heat. 200 F is a good temperature you don't need to actually boil the water. Stainless can, IMG_4340.JPG Aluminum lid with gasket IMG_4341.JPG IMG_4342...
by jbin
Mon Feb 22, 2016 2:49 pm
Forum: Tips & Tricks
Topic: Three post curing methods comparison
Replies: 46
Views: 10646

Re: Three post curing methods comparison

It is not about what works, it is about what works better :) Heat distorts the patterns, not a lot but it does, you loose the crispness of edge that the original print has. UV by itself is not great even with the water or an inert atmosphere, the outer shell is cured but you still have uncured resin...

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