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3D scanning / 3D printing for old speaker part

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RoadRunnersDust View Drop Down
Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RoadRunnersDust Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2017 at 6:19pm
If you design it sensibly you could make the join pretty much seamless, especially with the accuracy of printing now... 

Just strikes me that having something printed and then having to do so much finishing on it with the potential to bollox it up in the process is a bit much... especially something that the shape and dimensions are fairly critical and hand finishing it would be difficult to maintain

I dont see how gluing half the segments together, filling it with foam, repeating with the other half of the segments then sticking the two halves together and a light finishing would be more difficult than hours of finishing for an end product that might then not match the item its replacing
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Hemisphere View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2017 at 6:57pm
The amount of finishing required with FDM is as much as you specify it to be. It could be a big job applying coats of filler into rough grooves and sanding out crevices, or it could be a couple of spray coats and polish.


FDM can be as fine as this chess piece, although that will put the price up. There are also finishing services that can be applied to the FDM part by the shop.

Even nesting the parts is still going to be quite wasteful with segments of a phase bung. Easily 50% unused, could be 70%. Unless you chop it into really small segments like 16ths. Which could work I suppose! Depends how you designed the bracing structure and assembly stages, but it's all starting to look like a lot of design work for a one off replacement part. You could practically design your own complete 3D printed horn and bung structure if you'll be putting that sort of effort in.

Maybe SLS shouldn't be ruled out though. There are services which also offer SLS parts on a 'per cc of material used' basis, or using a a combination formula that accounts for material and bounding box volume. They usually work out more expensive, but are worth a try as they offer immediate online quotes for an uploaded model, so that offers a good benchmark to compare alternatives to.




Edited by Hemisphere - 25 July 2017 at 7:06pm
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Robbo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbo Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2017 at 8:03pm
I may be able to help here as I have some of the 8" phase bungs and back bowls buried in my garage--all are new and unused.
Bear with me for a couple of days and I will dig them out and have a look.
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Requiem View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Requiem Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2017 at 9:16pm
Originally posted by Robbo Robbo wrote:

I may be able to help here as I have some of the 8" phase bungs and back bowls buried in my garage--all are new and unused.
Bear with me for a couple of days and I will dig them out and have a look.


 
Robbo, you would be my favourite person for like... the rest of my life.

My heads hurting looking at all this stuff regarding 3d printing that I dont understand Dead

That's not to say i'm not extremely grateful to you guys for your input though! Just getting a few replacement bungs will probably be much cheaper. (will probably have the same problem in 3/4 years again, but hopefully 3d printing will be dirt cheap by then Wink )
www.requiem-soundsystem.com


Custom Martin Audio WSX, USB & CSG Soundsystem based in Bristol
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Hemisphere View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2017 at 9:40pm
It will be for sure.

It's just a matter of time before all the guff we're talking about gets sorted into a convenient arrangement between service providers and customers, and some of the more experimental ideas like piecing together sections or composite shell/core will be more widely understood and hopefully some standard practices established.

For some people it's clear enough already, it just doesn't seem to have filtered down towards speaker building/diy communities yet for some reason. 

Same happened with solar power - everyone was massively sceptical about it's potential for decades, but a few nutters got some excellent creative uses out of it, and now it's pretty mainstream.

I honestly don't think 3D printing will ever be the best option if you're talking about 'input idea into computer and hit print'. Same reason you don't use an inkjet printer to print magazines, it's just not the right tool for the job. You'll never 3D print a sub enclosure in solid plastic for the same reason you'd never build one as a fibreglass layup.

But if you consider it as just one part of a set of industrial processes it's got loads of interesting potential. You can use it to print moulds for silicone rubber casting, for example.
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