More 3D design nonsense

[JP]

Did you source the CF domestically?

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[Vidar]

I think the 3D printing will be easier if all the openings and holes point in the same direction. That will sidestep potential issues with overhangs, bridges and deformation.

I might also have split that long part, maybe along the middle. That way the 3D printing of each half could start off from with a big flat surface and build up towards the curved areas. Starting with a flat surface (on the equally flat 3D printers build platform) minimizes the need for supports and manual finishing work afterwards. Maybe I'm just lazy? (Ok, just asked here, and I have it from good authority that it is true  ).





 

 

[Grant Lamontagne]

Did you source the CF domestically?

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Nope, from China (I think) on eBay.

Def

[Grant Lamontagne]

I think the 3D printing will be easier if all the openings and holes point in the same direction. That will sidestep potential issues with overhangs, bridges and deformation.

I might also have split that long part, maybe along the middle. That way the 3D printing of each half could start off from with a big flat surface and build up towards the curved areas. Starting with a flat surface (on the equally flat 3D printers build platform) minimizes the need for supports and manual finishing work afterwards. Maybe I'm just lazy? (Ok, just asked here, and I have it from good authority that it is true  ).

That makes sense, which is of course why I hadn't thought of it.  There are several sections of that part that could be split, the way I designed it.  I could say that it is so obviously designed to be split that I must have meant to do it that way, but I'd be lying.... 

I'll admit my first response to that suggestion was "Oh great, more assembly and potential weak points" but as I pointed out before, I will skin it in carbon fiber (non locally sourced, but if I was to go into even limited production I'd probably rethink that as it took forever to arrive) it should be more than strong enough for anything I am going to do with it.

It is however a little thick, so I will need to cut some of the size out of it.

Def

[Vidar]

Personally I've ended up splitting pretty much everything that needs curved surfaces on all sides. At least my end results are better that way than going with a single part with supports.

(I make sure to add two matching blind holes in each split to make them easy to fit and assemble perfectly later using short pins).

For structural purposes I also try to orient the parts so that any areas in tension are built parallell to the build platform. That helps remedy the structural weakness between layers often introduced with 3D printing. Then again I don't use carbon fiber which should make that a non-issue. It will be interesting to hear your experiences with adding that. 

[Grant Lamontagne]

Yeah, I am hoping the CF will make up for a lot of my mistakes! 

Def

[Vidar]

I'm pretty sure my mistakes can dwarf any fiber  But I usually also outlast and grind away mistakes through stubborn retries

(A few times that just ends up with me in a really deep hole though. Turns out the answer to "how hard can it be?" is sometimes "real hard").

[Dutch_Tooler]

Grant, what kind of printer parts and materials are we talking about? Maybe someone here has a printer that can print them...

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[Grant Lamontagne]

It's just a simple carriage mount.  The new replacement hot end arrived yesterday but I haven't had a chance to install it and reassemble the machine yet though.

Def

[Grant Lamontagne]

Since some of the above images may be difficult to piece together for people not familiar with rudders, I have virtually assembled the latest set of modifications.

Def

[Whoey]

have you allowed for turbolaser batteries?

[Grant Lamontagne]

I couldn't find a suitable location to house the 5,000 megawatt generator I need for those....

Def

[BlueDot]

I guess the kayak season is mostly past. 
So that means you have 7 months to get the blame printer fixed and show off this cool project!

 

[Grant Lamontagne]

Yeah, indeed.  I have refined the design a little bit from the above, and I have also created a version for rudders that attach on the top of a boat that might be a lot easier to print since it sits flat.  They would both use the same blade, and I have lots of CF so that's not a huge concern.  I can probably make ten blades out of the CF I have. 

Def