Cars have ridiculously much electronics in them and you cannot "print" those just like that in a small shop. Have you seen how big wnd expensive a wafer fab is?
That said, there will always be some things for which economies of scale win out against customisation, and I suspect that many electronics components are in that bracket. Luckily we have things like FPGAs, so you don't need to keep a huge stock of specialised chips to make a wide variety of devices.
I don't think there is a market for cars without micro electronics. Especially not with the rise of electric cars.
FPGA's are several orders of magnitude more expensive than mass-produced electronics.
Modern cars contain more than just controller electronics. What about image sensors, for instance, for automated parking systems? You can't 3D-print an image sensor. Not without a clean room at least.
http://reprap.org/wiki/MetalicaRap
http://medtechinsider.com/archives/24967
http://www.nthdegreetech.com/printed-semiconductors.php
That said, there will always be some things for which economies of scale win out against customisation, and I suspect that many electronics components are in that bracket. Luckily we have things like FPGAs, so you don't need to keep a huge stock of specialised chips to make a wide variety of devices.