Any colour, ive done my diversity training.
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adjusted
While waiting for some more white PLA, I got agitated about the state of the support system for the mids towards. I have decided to rebuild this.
Got some chunky bits of wood etc for something nice and solid, and some twin slot stuff. And then decided some fine adjustment was required:
This is a system for adjusting the angle a compression driver points up at. By rotating the bottom cog-like thing, I can adjust the vertical angle at which the driver points by steps of less than a degree, between zero and about 15 degrees. Rather pleased with that.
3d printing is cool.
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OK update time. I’ve changed the process, and it’s now really quick.
I have amended my macro that extracts info from the JMLC spreadsheet; it now produces circular splines. @coco has written a script that imports these into Fusion (it already had an import spline add-in - he added the functionality to import more than one at once). Running these produces this:
You can see the concentric blue lines - these are the splines. Fusion has a loft function that connects one loop to another; it happily accepts multiple profiles and creates a best fit curve. That’s the horn surface.
There it is with a mirror finish added so you can see how smooth it is.
This workflow is great - you spend a bit of time trying different profiles on the spreadsheet, and it’s just a couple of minutes to create it as a nice horn profile in Fusion that you can spin round and really see well. Pleased.
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Meanwhile I’ve been printing them:
They are printed in two halves due to the size limitations of my printer. The printer can do about 20cm cubed, and these are almost 40cm wide. I modelled in some bolt locations so that I could align and squeeze them together while they’re being glued.
You can see a slight misalignment at the bottom. I’m not sure how precious I am about this, but I have improved the bolt/alignment system for the next one. We’ll see how that goes!
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How many halves can you have in a whole?
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So tomorrow I should have a completed second horn, and can listen to them properly. The tacos had a sharp edge (they were made in Blender, and that doesn’t have the same functionality for rounding over that Fusion has), and I think that this is clearly audible. I have high hopes for these really.
The next project is woodwork - I’m going to build a much better support system for the three compression drivers. That might be this week, depending on weather and energy levels.
After that I’ll be working on a horn for the 2441s, probably an e-jmlc around 220-250Hz unless that gets far too big. That will involve a lot of modelling of the interfaces so I can assemble it, this issue is far from trivial. I may end up getting an extension system for the 3D printer before starting, not sure.
If anyone thinks they might want a horn, shout up. The PLA for a single horn the size of these is just over a tenner, so it’s not expensive to experiment.
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Ooh, a 600hz pair like the above to fit my S2’s? 
I’ll model one and see. Is that a 1.4" throat?
I. 5" - an inch and a half. That would be exciting!
Like that? It would be 50cm x 20cm and 22cm deep, so could be printed in three pieces I think. I modelled 1.4", so it would actually be a fraction smaller.
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Very cool. 
So I’ll see how the one I’m currently printing comes out, to see how the bolt system works out. If it’s good, I’ll make you some.
What colour do you want? I use the Sunlu PLA here: https://amzn.eu/icNSBSF will need 2 or 3kg I think
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Is it very black or more dark grey? Not bothered really, just askin’ 
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“Lock me in the cupboard mother and feed me pins!” Fucking brilliant.
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Plan.
It’s quite black, but I hesitate to say this to someone who probably cares about the depth of blacks more than most!
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