No no no
Firstly the applications are very limited. WTF is your washing machine doing that requires a 64-bit, quad-core, multi GHz processor? The processing power required for the bluetooth stack necessary to talk to your phone is many times what the washing machine actually requires. As a gadget fan and lover of computing power it's easy to forget that a $5 SOC can provide more than most devices will ever possibly need.
Secondly, this is absolutely terrible from a modularity point of view. What we want is a protocol that says
Hello scanner, scan now.
Hello phone, scanning
Phone, here is your 3-d image file.
We really really don't want every phone to need to understand the inner workings of every possible scanner. That involves some device driver horrors that surely we've moved away from now not to mention the possibility of damage when some dumb motors in the scanner follow the connected phone's instructions blindly because the scanner doesn't understand that it's about to damage itself.
I remember the pain involved in getting old printers to work even with a computer directly connected to them with a disk from the manufacturer. That's bad. What's good is USB storage, one standard.
Thirdly, phones are personal. I don't want to put it in my washing machine's cradle, I don't want to be unable to answer calls or play angry birds while I wait for my 3-d parts to print.