  We study in detail the ejecta conditions and theoretical nucleosynthetic
results for 18 three-dimensional core-collapse supernova (CCSN) simulations
done by F{\sc ornax}. {Most simulations are carried out to at least 3 seconds
after bounce, which allows us to follow their longer-term behaviors.} We find
that multi-dimensional effects introduce many complexities into ejecta
conditions. We see stochastic electron fraction evolution, complex peak
temperature distributions and histories, and long-tail distributions of the
time spent within nucleosynthetic temperature ranges. These all lead to
substantial variation in CCSN nucleosynthetic yields and differences with 1D
results. We discuss the production of lighter $\alpha$-nuclei, radioactive
isotopes, heavier elements, and a few isotopes of special interest. Comparing
pre-CCSN and CCSN contributions, we find that a significant fraction of
elements between roughly Si and Ge are generically produced in CCSNe. We find
that $^{44}$Ti exhibits an extended production timescale compared to $^{56}$Ni,
which may explain its different distribution and higher than previously
predicted abundances in supernova remnants such as Cas A and SN1987A. We also
discuss the morphology of the ejected elements. This study highlights the
high-level diversity of ejecta conditions and nucleosynthetic results in 3D
CCSN simulations and emphasizes the need for additional long-term {($\sim$10
seconds)} 3D simulations to properly address such complexities.
