  In recent years many efforts have been undertaken to simplify coil designs
for stellarators due to the difficulties in fabricating non-planar coils. The
FOCUS code removes the need for a winding surface and represents the coils as
arbitrary curves in 3D. In the following work, the implementation of a spline
representation for the coils in FOCUS is described, along with the
implementation of a new engineering constraint to design coils with a
straighter outer section. The new capabilities of the code are shown as an
example on HSX, NCSX, and a prototype quasi-axisymmetric reactor-sized
stellarator. The flexibility granted by splines along with the new constraint
will allow for stellarator coil designs with improved accessibility and
simplified maintenance
