A 3D printer includes a build plate, a carriage movable alongside edges of the build plate between a front and rear of the build plate, and an arch connected to the carriage and movable therewith. The arch includes a pair of legs and an upper cross bar. A cross support is connected to the arch and extends between the legs and is movable between opposite ends of the legs. A tool head is connected to the cross support and is moveable along the cross support from one of the legs to the other. The interconnection of the legs to the carriage permits the arch to pivot between a printer operational condition in which the legs of the arch extend upright relative to the build plate and a collapsed condition in which the legs of the arch extend along the side edges of the build plate.
