Derive a general analytical model $($equation$)$ for the volume build rate of a direct, vector$-$scan, single$-$laser SL process in terms of the following parameters: Effective laser spot size or cured line width on the surface $($Lw$)$; Cured layer thickness $($Zr$)$; Laser scan speed $($Vs$)$; and time per layer to configure the next layer of liquid resin, the recoating or wiper time $($tw$).$ Assume neighboring $($cured$)$ tracks in a layer are just touching $($not overlapping$)$ at the surface, but overlap about $10\%$ maximum with the layer $($tracks$)$ below. Assume the uncured volume of resin between tracks is part of the build volume. Note that linear shrinkage $($SL$)$ is already included in the track cross$-$section dimensions, but not in the length direction