As far as material is concerned, isn't Continuum tonearm using similar type of material? I thought somebody even mentioned in the past that Copperhead arm may actually be the first 3D printing arm or at least used some earlier technology along 3D printing line?
I don't know where you appear to have obtained your 'information' as there have been numerous reviews and articles about the Cobra and Copperhead arms over the last 8 years with not one of them ever mentioning '3D Printing'?
The Cobra and Copperhead armwands are 'Reshape' Shape Optimised, Resonance Tuned Compound Curve Wands from proprietary woven fibre technology pioneered by Continuum Audio Labs.
The wands are unique monocoque construction using advanced fibre and resin technology proprietary to Continuum Audio Labs.
"Woven fibre and resin technology" is currently not able to be utilised in 3D printing.
If Continuum HAD in fact developed the first 3D printed tonearms......Harry Weisfeld would look pretty silly making such a 'song and dance' about it 10 years down the track?!