<div dir="ltr"><div>Hi Alec,</div><div>I've done some recent experiments lately with 3D printing underwater parts for my rebreather and pressure housings for lights. I think you may find that the print is porous enough to not retain pressure - this was my finding for cheap nylon SLS stuff (although I imagine you have a FDM machine) - I could blow through it! The more expensive nylon SLS option is great, holds pressure and even smooth enough to make an O-ring seal with no post-processing.</div><div><br></div><div>I think your partially air-filled print would quickly become fully waterfilled, which is probably not a big deal.</div><div><br></div><div>Actually while I think of it, does anyone have any negative experiences with nylon absorbing water?</div><div><br></div><div>Cheers,</div><div>Steve</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 14, 2016 at 11:19 AM, Rick Patton via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Some really nice work and good documentation, Thanks<br><br></div>Rick<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Jun 13, 2016 at 3:01 PM, Alec Smyth via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div><div class="h5"><div dir="ltr">Hi all,<div><br></div><div>I'm going to test using 3D printed Kort nozzles on Shackleton, and I have an interesting unknown. It would be nice to print them solid, but it would just take too long and probably create shrinkage issues. So the question is, what fill percent suffices (in 3D printing you get to specify the percentage of material fill, the rest being air). I called Greg Cottrell and he didn't have any data on prints, but he did have some on the depth rating of different types of buoyancy foam.I did a napkin calculation and it would appear that, at least if the print behaves like foam of similar density, I'm fine. But does anyone have any data on this? Or does anyone have a small pressure test chamber for which we might print some test samples? I would need to test to about 500 psi.</div><div><br></div><div>BTW I've updated Shackleton's project page: <a href="http://www.psubs.org/projects/1234567810/shackleton/" target="_blank">http://www.psubs.org/projects/1234567810/shackleton/</a></div><div><br></div><div><br></div><div><br>Thanks,</div><div><br>Alec</div></div>
<br></div></div>_______________________________________________<br>
Personal_Submersibles mailing list<br>
<a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br>
<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="noreferrer">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br>
<br></blockquote></div><br></div>
<br>_______________________________________________<br>
Personal_Submersibles mailing list<br>
<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br>
<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="noreferrer">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br>
<br></blockquote></div><br></div>