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A Dodecahedron Speaker for Desktop Printers

by seanmichaelragan, published

A Dodecahedron Speaker for Desktop Printers by seanmichaelragan Jun 4, 2012

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Description

A dodecahedron speaker can be a useful tool in acoustics research, and is definitely a fun toy to pull out at parties. They are available commercially, but pretty expensive. Some people build their own, but the odd compound angles and the high degree of accuracy and precision required in the parts make for challenging work with manual tools. It's a perfect job for a 3D printer. Total cost for parts and materials is just under $100. That includes speakers, hardware, wires, cable, plastic filament - everything.

Recent Comments

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So I don't suppose you'd be ok with my just sending these to shapeways or similar? I'm looking at combining your speakers with a raspberry pi that allows me to sling these around with a big battery case and the PI to catch the music over WiFi. Perhaps modifying NTPv2.0 so that I can calculate delay and add in delay to the music to avoid amplifying out of phase audio. I'm looking at doing a couple dozen so that I can amp up a large open area but without needing to use massive speaker stacks.
Thanks very much! Though the printing is automatic, there is in fact a lot of time and energy involved printing a set of these parts on my equipment--not least of which is that I'd have to get the printer set up and working again! Point being I'd have to price them pretty steeply. I intend to make these models available through my Shapeways store, but they'll be pretty expensive through there, too, unless I (or somebody) takes the time to hollow them out so you don't end up paying for a lot of powder volume you don't really need.

I guess the short answer is: Sorry, I don't see that happening right now. You should feel free to download these models and contract with whomever you like to print them, however; they are CC licensed and I don't need any money if you want to print them. Attribution and sharealike are required, however--click on the license icon for more info.

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Instructions

The high symmetry of the dodecahedron is amenable to a modular design, and this one consists of four basic parts: the face modules, the vertex plugs, the edge gaskets, and the bezels. The speaker grilles are made from hardware store window screen cloth installed in the bezels using rubber spline and a screen roller tool, just like a residential window screen.

The assembled speaker array weighs 5.6 lbs, not counting the cable, and measures 7.5" across, from face to face, and 8.6" from point to point. The speakers are wired in a hybrid series-parallel circuit that brings the total array impedance to about 10 ohms (again not counting the cable) which should be a comfortable load for most amplifiers.

Non-printed parts ("vitamins")

12 pcs × speaker, square, ferrite 3", 8 Ohm, 3W, Jameco SP83W
10 ft × instrument patch cable, 18 AWG leads, such as Conquest Sound CS118
30 pcs × sex bolt (hehehe), combo truss head, zinc plated, 3/16" barrel, #6-32 × 3/8", Bolt Depot 14285
30 pcs × machine screw, combo truss head, zinc plated, #6-32 × 1/2", Bolt Depot 2887
60 pcs × split washer, #10, zinc plated, Bolt Depot 3023
108 pcs × wood screw, #4 × 1/4", black oxide or finish of your choice, such as McFeely's 0402-PSK
13 ft × screen spline, vinyl serrated, 1/8", black or color of your choice, such as Home Depot 3028737
3 sq ft × window screen, black or color of your choice, such as Home Depot 3003947
36 in × hook-up wire, stranded, 18AWG, white or color of your choice, such as NTE
18 in × hook-up wire, stranded, 18AWG, red or color of your choice, such as NTE
2 pcs × craft foam, adhesive-backed, 8.5 × 5.5" sheet, black or color of your choice, such as Fibre Craft
2 pcs × wire nut, orange, such as Ideal 73B
1 cu ft × glass wool, such as Owens Corning PINK
6 in × electrical tape

Detailed assembly instructions available here:

instructables.com/id/A-Dodecahedron-Speaker-for-Desktop-Printers/
So I don't suppose you'd be ok with my just sending these to shapeways or similar? I'm looking at combining your speakers with a raspberry pi that allows me to sling these around with a big battery case and the PI to catch the music over WiFi. Perhaps modifying NTPv2.0 so that I can calculate delay and add in delay to the music to avoid amplifying out of phase audio. I'm looking at doing a couple dozen so that I can amp up a large open area but without needing to use massive speaker stacks.
These look amazing. Unfortunetly I don't have a 3d printer. Would you be willing to sell a preassembled set for a fee? Thanks
Thanks very much! Though the printing is automatic, there is in fact a lot of time and energy involved printing a set of these parts on my equipment--not least of which is that I'd have to get the printer set up and working again! Point being I'd have to price them pretty steeply. I intend to make these models available through my Shapeways store, but they'll be pretty expensive through there, too, unless I (or somebody) takes the time to hollow them out so you don't end up paying for a lot of powder volume you don't really need.

I guess the short answer is: Sorry, I don't see that happening right now. You should feel free to download these models and contract with whomever you like to print them, however; they are CC licensed and I don't need any money if you want to print them. Attribution and sharealike are required, however--click on the license icon for more info.
can you print the mesh?
Wondered about that. Would be difficult, and not very durable compared to windowscreen, I expect. But I didn't experiment at all. You should.
hmm maybe ill make some hexagonal grills.
i just ordered some surplus ipod speakers, i think they are about 2 inches, so im going to scale this down. they have these chrome dust covers and i was thinking i might use the dish to distort a laser based on the sound.
Great job! I think I would use cladding silicone instead of gaskets for durability, adhesion and stretch tolerance. It also absorbs vibrations better.
Great tutorial and great idea, i'm making one!!!

Only one question, as i haven't any experience in this kind of speakers: HOW DOES THIS SOUNDS???

i mean the speakers are quite small....

Thanks! :-D
Get those speakers with titanium or aluminium weave cones. They are heavy and sound awesome. I ripped off mine from my old creative gaming speakers.
Excellent work. This whoops my monitor speaker mount that just failed to print properly. Have had much success using dense cushion foam as sound deadening material in test chambers. Usefully fireproof too =-X
"dodecaquadraphonic sound." Sounds awesome. Thanks for the great design.
Nice job! I particularly like the grills-nice detail that leavs the speakers looking polished. Thats one of the things we found most challenging in our laser cut dodecahedron speaker - in the end we went for that classic minimalist look! thingiverse.com/thing:21272
Thanks, and great to hear from you. I am quite aware of your Sputnik 17 project. I have followed the Thingiverse RSS feed religiously for years, or at least I did until I decided to enter this silly Instructables contest, and then every awesome thing that came up on T-verse started to undermine my confidence: surely my precious dodec speaker concept could never beat THAT. Your thing #21272 was the straw that broke the camel's back, and I stopped reading the feed for the sake of my own rapidly fraying nerves. Your design is easier to make than mine and includes a generator script so you can make various sizes and aren't locked in to using a particular speaker model. This is something I wanted to do, but didn't really have the time to figure out with my limited OpenSCAD skills. I was sure you were going to enter Sputnik 17 in the Make It Real challenge and kick my ass with it. It looks, now, like you didn't, as I far as I've been able to tell, for which I am very grateful. And even if you did, and I missed it, the deadline has passed, it's out of my hands, and I'm happy to let things shake out as they will over on Instructables. And I can go back to enjoying the T-verse RSS feed and finally say to you what I wanted to say when I first saw your project: Beautiful work!
Thanks for the kind words, although you are too modest! Very nice work and great use of color.
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