Step 7: Finished Mold

Once the prints have been washed and dried, they are ready to go.  I was casting expanding foam and I did not need any further prep other than mold release; different casting materials might differ and I will surely do more experiments and write up my results.
<p>How did you get access to the Object Connex printer? Does Instructables run a print service? Note that the ABS created by a PolyJet printer like that is not quite the same as the ABS filament most people are using on their own desktop printers. I got some turtle wax to see if it works on regular ABS.</p>
<p>Instructables' Pier 9 facility has several Objet Connex printers. Currently the only way to use them is through the Artist in Residence program, which is expanding rapidly. There's a link about it at the bottom of every page.</p><p>Did the turtle wax work on regular ABS? I haven't tried that as the desktop FDM printers haven't got quite the resolution needed for this kind of thing and a lot of surface prep would be needed - my thinking on that is Bondo but I haven't tested it yet. I'd be interested in your results!</p>
<p>The turtle wax did work as a mold release on regular ABS, but I was using Great Stuff window insulation as the foam and that did not work. The problem with that kind of foam is that it shrinks as it dries so you get a wrinkly and deformed surface.</p>
<p>Check out Smooth On for foam products. </p><p>http://www.smooth-on.com/Rigid-and-Flexible/c10/index.html</p><p>Ive not had good luck with Great Stuff foam products for builds. </p>
<p>rachel can i get your direct number? i have a furniture(antique reproduction) project, know very little about cad and all the keying for mold can you help?</p>
Nice job! What CAD software are you using in this instructable? Thanks
I use a program called Moment of Inspiration (http://moi3d.com) for most of my projects.
At first I thought, what's the point, how useful could this be? But then I remembered how hard it is to find really good molded insoles for my feet. Then I thought, I could even make insoles and sandles that perfectly fit anyone's feet! This is most impressive. <br>Thanks, and Merry Christmas!!
What mold release compound did you use? I am also trying to make expanding foam parts on a 3d printed mold.
I ended up using Turtle Wax, yeah the car stuff. It worked fine, not great but not bad. The silicone spray I tried was noticeably worse, which surprised me. I'd be interested if you find something better, as the wax needed to be spread in just the right thickness in order to keep the foam from sticking, but also not impede its expansion. I'm almost done with a foam casting Instructable which I should be able to publish in the next few days, with more information. If you come up with a better release agent I'd love to hear about it!
APW wax is what you need, http://www.cfsnet.co.uk/acatalog/CFS_Catalogue__APW_Soft_Release_Wax_426.html here's an example. Don't know where you from but you should look for it ;) Looks great but small question; Why didn't you 3D print the part en Cast the mould? would have been cheaper no?
And what kind of expanding foam did you use? was it the two-part A B foam, or was it great stuff/ spray foam?
Awesome tutorial, thanks for sharing. <br> <br>I have posted a link to this on the Shapeways blog <br> <br>http://www.shapeways.com/blog/archives/1707-Instructable-How-to-Make-a-3D-Printed-Mold.html <br> <br>Cheers
Resolution is quite a bit finer than my RepRap. I want one of those.
excited to see the final product!
Nice molds!

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Bio: I run Neal's CNC in Hayward, CA, an expert CNC cutting and fabrication service. Check out what we do at http://www.nealscnc.com ... More »
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