An additive manufacturing system for printing a three-dimensional part, the additive manufacturing system comprising: a mobile housing defining a front housing section and rear housing section; a photoreceptor drum within the mobile housing, defining a drum outer surface; a charging electrode within the mobile housing, positioned to apply electrostatic charge to the photoreceptor drum outer surface; a laterally stationary platform disposed outside the mobile housing adjacent a workpart; and a controller circuit for traversing the mobile housing about the workpart while selectively applying at least one laser diode emission onto the photoreceptor drum to expose a layer definition on the photoreceptor drum outer surface, the controller circuit simultaneously rotating a front charged powder roller and a rear charged powder roller in counter rotational directions, respectively synchronized with and counter to the front and rear rotational directions of the photoreceptor drum, thereby presenting a developed portion of charged powder onto the layer definition of the photoreceptor drum and subsequently transferring said developed portion onto the workpart as respective metal print layers (66,68); characterized in that: front and rear microwave emitters (58,60) are disposed inside the mobile housing for fusing the respective metal print layers (66,68) after they have been transferred onto the workpart; and front and rear induction coils (62,64) are disposed inside the mobile housing for pre-heating the workpart prior to transfer of the respective metal print layers (66,68) onto the workpart; and the laterally stationary platform comprises at least one charged transfer electrode. a mobile housing defining a front housing section and rear housing section; a photoreceptor drum within the mobile housing, defining a drum outer surface; a charging electrode within the mobile housing, positioned to apply electrostatic charge to the photoreceptor drum outer surface; a laterally stationary platform disposed outside the mobile housing adjacent a workpart; and a controller circuit for traversing the mobile housing about the workpart while selectively applying at least one laser diode emission onto the photoreceptor drum to expose a layer definition on the photoreceptor drum outer surface, the controller circuit simultaneously rotating a front charged powder roller and a rear charged powder roller in counter rotational directions, respectively synchronized with and counter to the front and rear rotational directions of the photoreceptor drum, thereby presenting a developed portion of charged powder onto the layer definition of the photoreceptor drum and subsequently transferring said developed portion onto the workpart as respective metal print layers (66,68); characterized in that: front and rear microwave emitters (58,60) are disposed inside the mobile housing for fusing the respective metal print layers (66,68) after they have been transferred onto the workpart; and front and rear induction coils (62,64) are disposed inside the mobile housing for pre-heating the workpart prior to transfer of the respective metal print layers (66,68) onto the workpart; and the laterally stationary platform comprises at least one charged transfer electrode. front and rear microwave emitters (58,60) are disposed inside the mobile housing for fusing the respective metal print layers (66,68) after they have been transferred onto the workpart; and front and rear induction coils (62,64) are disposed inside the mobile housing for pre-heating the workpart prior to transfer of the respective metal print layers (66,68) onto the workpart; and the laterally stationary platform comprises at least one charged transfer electrode.