if you're a hack space you should team up and make the CNC yourself, or with favors from friends...free labor!

PCBs machine have to be high resolution, slow, very little to no play in the couplings and very very flat.

wood needs to be cut fast otherwise it will burn the cutter/wood

and for doing metal it needs to be rock solid.

I'm sure one machine could do it all but building small machines are much easier