I don't have any experience on the CNC side, but from a 3D printer perspective, it could depend greatly on what you want to print with it. PLA should be fairly easy but keeping the print bay warm enough for ABS at that size might be a challenge. The structural rigidity and accuracy I expect you're sticking in for the CNC side will be more than enough for any 3D printing (I'm assuming the generic PLA/ABS plastics for now)... it's a big old print area though :) lots to heat up!