In embodiments, an additive manufacturing apparatus (100) comprises a chassis assembly and a skin at least partially covering the chassis assembly. The chassis assembly comprises a lower chassis section secured to a low voltage chassis section (608); an upper environmental chassis section (602) secured to and extending over the low voltage chassis section and the lower chassis section; a high voltage chassis section (606) secured to the upper environmental chassis section and the lower chassis section; and a build receptacle carriage (624) adjustably coupled to the lower chassis section. The skin comprises first and second doors providing access to the low voltage chassis section and the high voltage chassis section; a rear panel providing access to the upper environmental chassis section; a top panel covering a top of the upper environmental chassis section; and at least one hinged door providing access to the lower chassis section.