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Most "printed" electronics mean either organic semiconductors, which generally have poor performance but are very cheap to print and flexible. This company also offers polysilicon, which is generally more expensive but is higher performance - it's used for TFT displays, for example. Both of these are usually patterned, so it's more for volume production that one-off like 3d printing.

I am not actually sure what the benefits of sheet-based logic are - RFID is obvious, but existing vendors prefer tiny, inflexible monocrystalline silicon dies instead. Are the Thinfilm RFID tags cheaper?

ARM demoed some printed SoCs (based on Cortex M0) a while back: https://semiaccurate.com/2015/11/18/arm-charts-path-printed-... The process is described here: http://www.molecularimprints.com/technology-overview/j-fil-o...

I'm thinking so, given they say that they can print displays and memory. That suggests that they can do a pretty decent number of semiconductors, which indeed could be rather useful.