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-   -   Open source Waveguides for CNC & 3D printing! (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing.html)

augerpro 7th April 2020 12:52 AM

Just an update, still working the issue above. There are a couple ways to address it and I'm working out the most elegant that won't cause other unintended issues in the future. I'm also doing wavelet analysis that will be uploaded to the site too.

NicoB 18th April 2020 01:47 PM

When you post measurement about "SB26" like in your website you refer to the "SB26 ST" or still ADC ?
Thanks

augerpro 19th April 2020 11:16 PM

Update: I've updated the SB21 and SB26 files to correct any hint of a problem that may cause a printing issue.

Quote:

Originally Posted by Mandroid (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6146673.html#post6146673)
The tweeter interface and waveguide profile are serviceable, but the phase shield support is deformed on all three.

All I can think to do is make the arms thicker. From my small experience with printers it seems like very thin - especially unsupported - features can warp. Although proper slicer setup should prevent that, but I doubt commercial outfits are taking the time to do it.

Quote:

Originally Posted by NicoB (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6167285.html#post6167285)
When you post measurement about "SB26" like in your website you refer to the "SB26 ST" or still ADC ?
Thanks

I'm virtually always talking about the metal dome versions, particularly the ADC. If I talk about the the fabric STAC version I'll be clear about it being that version.

mainframe99 20th April 2020 12:18 AM

1 Attachment(s)
Hi Augerpro - just finished reading the thread. Extraordinary work you are doing here for the DIY community.

I am also interested in getting some sb26adc waveguides, but like Mandroid mentions above, I am also in agreement the phase shield should be supported at three points, not two. Like the original manufactures phase shield. This would greatly reduce the risk of warping or twisting post printing. Could adjustments be made to do this?

Attachment 835796

augerpro 20th April 2020 02:38 AM

Have you used a 3D printer before? I don't believe the number of arms will make a difference, it is much more likely to do with slender objects hanging out in space. That is very tough to print correctly, and requires the operator be experienced with their slicer and printer.

morbo 20th April 2020 03:12 AM

2 Attachment(s)
Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6169805.html#post6169805)
Have you used a 3D printer before? I don't believe the number of arms will make a difference, it is much more likely to do with slender objects hanging out in space. That is very tough to print correctly, and requires the operator be experienced with their slicer and printer.

Exactly. I have printed this very waveguide several times with no problems - because I know how to use supports and print slowly, with a suitably sized nozzle, at a suitably low layer height. This does require my printer being in good mechanical condition and properly calibrated (esteps, extursion multiplier, etc). It does require careful support removal and a bit of filing/sanding to get the edges as clean as I'd like, but is doable.

augerpro 20th April 2020 04:04 AM

morbo> is there anything I can do that would help in most circumstances? Certain sizes, geometries, etc?

morbo 30th April 2020 03:43 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6169855.html#post6169855)
morbo> is there anything I can do that would help in most circumstances? Certain sizes, geometries, etc?


@Augerpro sorry I just saw this post now.

The only thing I think you could do is possibly create a model with supports included... This might save people printing the guides with suboptimal orientation (supports should be on the back, where the can't wreck surface quality of guide). I suppose you could make pre-sliced files available, but those are really only valid for one printer with one extruder/nozzle/filament combination.

I think what you are doing makes perfect sense, and is how other 3d parts are distributed. 3d printing is unfortunately still at the point where a lot of skill & knowledge are required to get good results, and a huge amount of trial and error. I got into it specifically to print your guides (though have done much more since) and have probably 200hrs of reading and tinkering to get to where I'm at now. I don't mean to discourage anyone but IME that is just the nature of the beast.

BTW I mentioned this on htguide, but will make the offer again here: if there's anything I can do to support your efforts with my printers, let me know. I think it's great what your doing and a huge contribution to the DIY audio world.

FrancoB 12th May 2020 03:55 PM

Let's say I want this waveguide CNC'ed straight into a 2 inch thick MDF/ply front.

So, no screw holes on the front. Has anyone done this before?

dwk123 8th June 2020 12:46 PM

Quote:

Originally Posted by FrancoB (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6202210.html#post6202210)
Let's say I want this waveguide CNC'ed straight into a 2 inch thick MDF/ply front.

So, no screw holes on the front. Has anyone done this before?

This is ultimately what I want to try to do as well. I think what you'll have to do is extract the mesh just for the shell and start from that. I've managed to successfully machine a shell designed with ATH4 using Vectric V-Carve, so if you can do this extraction it should work similarly. Meshmixer might be able to do the extraction, but I haven't spent enough time with it. Don't forget that you'll need to machine the back side as well for proper driver mounting, so it'll be a 2-sided operation requireing you to flip the workpiece and have good alignment/calibration.

For those that have successfully printed this at home, are you printing mouth-up with supports, or mouth-down? It imports into the slicer mouth-up so I'd guess that would be the recommended strategy, but with the small alignment nubs being the only points of contact in that orientation it strikes me that getting the back flange printed properly will be tricky.


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