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3D printed biradial ES-800 horn by Joseph Crowe
3D printed biradial ES-800 horn by Joseph Crowe
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Old 9th February 2020, 10:16 PM   #1
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
Default 3D printed biradial ES-800 horn by Joseph Crowe

I bought the 3D model from Joseph Crowe and now it is being printed. One half finished, second one will be finished in a few hours. My good old Beyma CP385Nds will be measured on this horn. One half uses ca 130 m of PLA filament and with 0.3 mm layer and 20% infill it takes about 15 hours to print. The bottom part on the first piece is slightly warped, but that is no big deal, since the top part is flat for glueing. The second one will be printed most probably with more infill so that I will use one spool for both halves. And it maybe will bend a bit less with more infil. Woden CNC'd would look better, but if I ever have these made, they would be the larger ES-600 for 1.4" driver, I have Beyma 755Nd on my shopping list
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File Type: jpeg 1E4F5307-175F-4F0A-B844-509BD20D2B88.jpeg (75.8 KB, 423 views)
File Type: jpeg DFB40CFD-127A-4B88-8A93-956A2012FB3B.jpeg (77.5 KB, 427 views)
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Old 9th February 2020, 10:39 PM   #2
tmuikku is offline tmuikku  Finland
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Cool! You are having fun aren't you, multiple interesting projects going on simultaneously
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Old 9th February 2020, 11:18 PM   #3
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
Yes, most of them unfinished due to lack of time to spend. But slowly getting there Waiting for the print to be finished watching with a night vision camera.
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File Type: jpeg 8D77D431-9DD0-4666-8EB7-4EC8A42D2CE0.jpeg (232.6 KB, 415 views)

Last edited by pelanj; 9th February 2020 at 11:22 PM.
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Old 10th February 2020, 01:43 AM   #4
camplo is offline camplo
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Nice! I've been researching 3d printing, from my reading it seems PTEG is good material to use, low shrinkage. I also think that 3d printers are capable of printing horn geometries with ease. The horns I intend to print are much much bigger though. What has your experience been?
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Old 10th February 2020, 07:38 AM   #5
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
This is my biggest print so far. I use PLA, because it is cheap and the quality is fine. PETG would be a better choice, I plan to use that for the finals. I had the UICW printed by a friend from PETG.

Printing a horn like this in two halves works, sliced into more parts would need more attention to the warping. For larger horns, I actually consider printing a mold instead and make the horns from plaster.
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Old 10th February 2020, 12:50 PM   #6
kipman725 is offline kipman725  United Kingdom
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The print looks very clean, what are the final dimensions?
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Old 10th February 2020, 03:47 PM   #7
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
The dimensions are ca 295 x 120 x 145 (WxHxD). I glued the halves with liquid nails - it took a while to align and clamp together, but the result is really good and will need only minimum of sanding and two layers of spray paint.
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Old 12th February 2020, 07:29 PM   #8
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
So here the first measurements of the unfinished horn at different angles. The dip is most probably a result of imperfect seal at the throat, it still needs to be sanded and maybe thin gasket applied - I can see light around the flange when I put a LED torch in the throat.

I think this is brilliant. A pair including the price of model purchase and a large tube of liquid nails and some putty and spray paint will cost me around 45 bucks (second half of the second horn is in the print right now). A killer deal! These make me want to get the larger horns made in nice wood and using my favourite Beyma CP755Nd drivers.
Attached Images
File Type: jpg ES-800wCP385Nd.jpg (125.6 KB, 93 views)
File Type: jpg ES800CP385NdDist.jpg (96.0 KB, 65 views)
File Type: jpg ES800IR.jpg (67.6 KB, 39 views)

Last edited by pelanj; 12th February 2020 at 07:40 PM.
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Old 12th February 2020, 10:37 PM   #9
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
The second horn will not be that nice, one print failed due to a power dropout just before the last layer was finished. And the second one warped badly because I managed to misalign the printer a bit while trying to save the first print after the power failure. The inner part of the horn is OK, so now I am waiting for the glue to dry. The crossover will be at 1.2 kHz, as the measurements suggest (and Mr. Crowe as well).
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Old 16th February 2020, 12:19 AM   #10
pelanj is offline pelanj  Czech Republic
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3D printed biradial ES-800 horn by Joseph Crowe
Here is the second print that did not turn out so well, this time measured with a DE500 - which had a soft foam gasket on its face and also I worked a bit on the throat attachment to make it more flat. This time no crazy dips as expected and the ungated measurement shows response down to 800 Hz. With a bit of EQ, the end result should be nice.
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File Type: jpg ES-800wDE500.jpg (80.8 KB, 31 views)
File Type: jpg ES-800wDE500nG.jpg (70.4 KB, 30 views)
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