So must have proved to be no better? I wonder if they progressed to texture for directional flow control?been following with interest but did you know your design is over 100 years old?!
LINK
patent has expired now though - can't find any other info so I wonder if major fiala ever producd a prototype

I haven't experimented with spirals, but if the angle of the spiral is decent (45% or better?) you might be able to print it vertically without supports.I have found in 3D it needed lots of supports during construction. having said that I have already incorporated extra supports in the form of felt\ foam supports to the exterior.
Preview on Bambu-
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Hi I haven't adjusted anything on the printer side of things, it was just what loaded on the app when the object was imported.I haven't experimented with spirals, but if the angle of the spiral is decent (45% or better?) you might be able to print it vertically without supports.
Also, perhaps arrange for each part to be completed before moving on to the next part.
Unless you have an ultra fast printer, I think you'll find the print times in the preview are a tad on the optimistic side (depending on your nozzle size and layer hight).
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Ian
Although a lot of people print with PLA, I'd suggest using PETG. PETG is slightly more flexible than PLA, better at surviving changes in temperature and easier to sand down and then bring back the colour.The good news is I have taken a leap and bought a printer, well Ive paid for it at this point in time.
Got a lot to learn which will keep me busy over these dark days.
I'm happy to offer my printer time if you wanted something printedThis is something I was thinking about myself the other day! I have ideas, but no printer, and no money to pay anyone who has one....![]()
Tinkercad is OK, but if you can get your head around Autodesk Fusion it's got a lot more features and for home use you can get a free to use version.I've got the main baffle drawn on Tinkercad and looking how to add the surface texture which isn't easy on the app.
Not used actual true dimensions yet, just working on the theory.


I have printed this on, available on Bambulabs and it works well. I suspect the 3D printed thread will become mis-aligned over time. We measured the dB levels and surprisingly internals made from ASA were quieter than ones made of PLA or even TPU.
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