G.l.: Yes, the idea of the spiral is scalability, being able to use the same design over a large or small area. I can easily modify the geometry so after some radius flow speed is reduced. I dont think it's so restrictive, currently it has 12 channels with 26.5 mm lenght.
Roscal:
I'm dont know how EDM work, but is impressive! Really nice machines you have available.
It can't be so secret your development if theres already 30 orders!
Where's that? in french forums?