I have been actually researching these technologies, there are a hand full of "digital" solutions available to do this. Basically a 3D impression scanner which then spits out a STL file into ear mold specific CAD software which then can be CNC machined or 3D printed. There is a new startup here around Boston that has a product to eliminate the whole impressions step and create a 3D impression that can be sent right to the software or manufacture.
Some pretty cool stuff, IMHO.
Welcome to the wonderful world of rapid prototyping!
The 3D printing machines (there are a dozen technologies in the field) started to emerge 15 years ago and were for long used mainly to produce prototypes and very small series from scratch (3D computer models--> prototype, no mould, no cast). They can produce small parts with many internal design which can't be made with a single mould.
I'm glad people are starting to use them for actual products, available resins for these machines have a come a long way and are now able to match the properties of most usual plastics and elastomers, which was definitely not the case 10 years ago (hence the main use for design prototypes only at that time).
The start-up you linked is really interesting. Casting earmolds is not a nice feeling, and a technology to map ear canals without pouring some nasty chemical into your ears would be more than welcome!
To come back to the topic, I took the plunge and ordered the ASG-1s, since the signature which was described seem to fit my taste for the most part.
Another hold-up in my wallet...