I have tried some stuff. It depends what problem you're trying to solve.
You can get metal infused filaments, both aluminium and copper infused filaments print fine. But since there's plastic as well you don't get the nice properties like conductivity.
If you just want some of the properties then electrolysis might be the better choice of technology.
If you want robust parts then as far as I know the traditional methods are the best as the metals properties are constant or controlled.
Something like cnc welding layers on layers wouldn't make sense in terms of cost and predictability I would think. You'd need too much heat and it's unlikely to be as strong as traditional metal forming. It has been used for a long time to spot weld, but not build up layers as far as I know.