Like deelowe said, for now, this DragonFly is limited to simple conductors/insulators(dielectrics), which means fancy 3D PCBs (or embedded antennas---see their RFID paper). Transistors, using semiconductors, are significantly trickier.
But special inkjet printers can actually print transistors (e.g., [1])! This is very exciting for the obvious reasons---integrate this with a DragonFly/PolyJet 3D printer/etc. to print complete electronc devices. However, the printers have to use different materials available in ink forms instead of silicon, and even the best are limited to ~20um feature sizes due to ink dispensing difficulties (vs. 0.01um current transistor sizes), so they're still in the research stage.
[1] Grubb et al., "Inkjet Printing of High Performance Transistors with Micron Order Chemically Set Gaps", Nature, https://doi.org/10.1038/s41598-017-01391-2