It's really just a matter of time until such manufacturing has a viable open source mainstream alternative. Then we can look forward to small dev shops building affordable custom robots for everyday use.
"Affordable" and "custom" tend to not go hand in hand. There are many people building tractors from scratch right now, just hop on YouTube for a look.
Want a custom accounting package for your small business? I'll build you a simple one for $30,000. In the meantime, you can go buy QuickBooks for $199 right off Intuit's site.
(I'm not saying it's a viable answer at this point but the work they are doing is intrguing.)