  We apply the physically more appealing MIT Bag boundary conditions to study
the Casimir effect on the lattice. Employing the formalism of arXiv:2005.10758
to calculate the Casimir energy for free lattice fermions, we show that the
results for the naive, Wilson and overlap fermions match the continuum
expressions precisely in the zero lattice spacing limit, as expected from
universality. In contrast to arXiv:2005.10758 where the result for the naive
fermions rapidly oscillates with the lattice size for both, the periodic (P)
and anti-periodic (AP) boundary conditions, no oscillations are observed with
the lattice size. Furthermore, the apparent violation of the universality for
naive fermion in arXiv:2005.10758 is shown to be cured by applying suitable
series extrapolation techniques, thus demonstrating that the Casimir energy for
the naive fermions with periodic/antiperiodic boundary conditions agrees with
the results for other free lattice fermions, and can as well be used to obtain
the results for the Dirac fermion in the zero limit of the lattice spacing.
