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No doubt many folk on here may have seen this on Instagram anyway as Bentley Components makes, well, bike components and might for all I know actually be on STW.
I doubt that he'll actually say how he did it so I hope he won't mind me sharing his latest creation on here and see if anyone has any ideas on how he actually machined it:
Fairly sure I can see a join
Glued together. A glue with the same refractive index as the plastic will be invisible.
Made from four layers of Perspex bonded together after machining by the looks of it. Great work!
A cheesy video. But this guy does the same thing for invisible joints (in glass but).
He's fessed up; done in two halves!