[PSUBS-MAILIST] 3D Printer plans for CO2 Scrubber

Tue Apr 7 14:22:15 EDT 2015

Alec, 

I did not get any attachments with this thread.  Could you maybe send them direct to bobtravis at comcast.net ?  I would really appreciate it!!  And I too would be happy to make extras or anything else I can do to help the group.  I rarely comment or ask questions but I read every email that comes through!  This site has been a HUGE help and, if the stars continue to shine on me, I will be testing my K boat this year!! 

Bob 

----- Original Message -----

From: "Alec Smyth via Personal_Submersibles" <personal_submersibles at psubs.org> 
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org> 
Sent: Tuesday, April 7, 2015 8:52:42 AM 
Subject: Re: [PSUBS-MAILIST] 3D Printer plans for CO2 Scrubber 

Guys, did this come through for you with the attachments? 

Thanks, 

Alec 

On Mon, Apr 6, 2015 at 11:34 PM, Alec Smyth < alecsmyth at gmail.com > wrote: 

OK, I'm not sure what our attachment limit is, but if it works there should be eight stl files attached.  

The scrubber consists of two cylinders, with the space between them filled with Sofnolime. There is a blind "fixed end" that caps both cylinders, and a "removable end" that serves as a lid to the space between the cylinders. This removable end is held tight against the scrubber agent in tension by two bungee cords. It is thick, so that as the scrubber agent settles the removable end can move into the cylindrical space keeping up the pressure and preventing the formation of air paths. Because thermal contraction makes thick parts challenging to print, there are two files (A and B) for the removable end. Print them separately, bolt them together. 

The non-printable parts are: 

- Two cylinders made of perforated brass sheet. The material for those is McMaster item # 9360T15. Roll the perforated sheet by hand into two cylinders of 1 7/8" and 5 1/4" diameters. I rolled the cylinders with about 1/2" overlap and put small pop rivets in the overlap to make a seam. Do this AFTER printing, so you can use the printed parts as diameter references. Vary the cylinder length as desired to increase or decrease Sofnolime capacity. Mine are 12" long. 
- The backup breathing hose is "Bilgeflex" white corrugated bilge pump hose from West Marine. 
- A SCUBA 2nd stage rubber mouthpiece. 
- The white external bars parallel to the cylinders and holding them together are fiberglass structural rods, McMaster part # 8543K53 , drilled and with  1/4" SS threaded rod inside. 
- The fan is a Delta Electronics BFB0712H, obtainable from Digikey as item # 603-1118-ND. 
- The rest is just a little bungee cord and a couple of tiny SS screws that go through the external and internal stiffeners to hold the outside cylinder to them. 

For details please refer to the photos on  http://www.psubs.org/projects/1234567810/printedscrubber/ 

Permission is hereby granted to all PSUBS members to use this design with the caveat that it is experimental and untested kit, and in the hope all who use it will also endeavor to improve the design. This is intended to be "open source". 

Best, 

Alec 

On Mon, Apr 6, 2015 at 3:51 PM, Bob Travis via Personal_Submersibles < personal_submersibles at psubs.org > wrote: 

<blockquote>
Would it be possible to get the stl file?  I just found out that I have access to a 3D printer as well 

Sent from my iPhone 

> On Apr 4, 2015, at 7:10 AM, Gregory Snyder via Personal_Submersibles < personal_submersibles at psubs.org > wrote: 
> 
> Alec, 
> For the record, you are awesome. 
> 
>> On Apr 4, 2015, at 9:00 AM, via Personal_Submersibles < personal_submersibles at psubs.org > wrote: 
>> 
>> Hi Alec, 
>> 
>> Thanks for sharing.  Perfect design for our sub.  Are the part and STL files available to share? 
>> 
>> Mark... 
>> 
>> ---- Alec Smyth via Personal_Submersibles < personal_submersibles at psubs.org > wrote: 
>>> Hi Mark, 
>>> 
>>> See http://www.psubs.org/projects/1234567810/printedscrubber/ 
>>> 
>>> Jon, perhaps we can make this open source by putting the files out on the 
>>> website somewhere? 
>>> 
>>> 
>>> Thanks, 
>>> 
>>> Alec 
>>> 
>>> On Fri, Apr 3, 2015 at 8:49 PM, via Personal_Submersibles < 
>>> personal_submersibles at psubs.org > wrote: 
>>> 
>>>> Hello Psubs group, 
>>>> 
>>>> Has anyone built a CO2 scrubber using a 3D printer that would be willing 
>>>> to share your plans and the STL files?  In return, I would be glad to build 
>>>> the plastics parts for anyone in the group.  Our 3D printer is capable of 
>>>> 12" x 12" x 12". 
>>>> 
>>>> Thanks, 
>>>> 
>>>> Mark... 
>>>> 910-638-5229 
>>>> _______________________________________________ 
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> 
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</blockquote>

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