Three dimensional (3D) printers; 3D printers; 3D printer components and parts, namely, kinematic printer bed mounts, carriages, enclosures, end mounts, extruder mounts; 3D printer kits comprising heated beds, yokes, side panels, carriages, motor mounts, idler carriers, electrical component boxes, wiring harnesses, chassis, enclosure feet, limit switch mounts, cooling shrouds