[PSUBS-MAILIST] Depth rating for 3D prints

[Stephen Fordyce via Personal_Submersibles]

Hi Alec,
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.

I think your partially air-filled print would quickly become fully
waterfilled, which is probably not a big deal.

Actually while I think of it, does anyone have any negative experiences
with nylon absorbing water?

Cheers,
Steve

On Tue, Jun 14, 2016 at 11:19 AM, Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Some really nice work and good documentation, Thanks
>
> Rick
>
> On Mon, Jun 13, 2016 at 3:01 PM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi all,
>>
>> 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.
>>
>> BTW I've updated Shackleton's project page:
>> http://www.psubs.org/projects/1234567810/shackleton/
>>
>>
>>
>> Thanks,
>>
>> Alec
>>
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>
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