Is there a material that reduces copper melting point and completely dissolves? Is there any material that you mix/alloy with copper that


will result in something that behaves similar to plastic (that is at room temperature it is solid, at maybe 500K or similar it can be easily formed/3D printed)
When heated even more (700K?) it will make the the included copper melt, and dissolves itself, leaving only solid copper.


Is this even theoretically possible? The main goal is to significantly reduce the temperatures involved, 700K is a ballpark number here. Also it doesn't need to be very thick if this makes things easier.
The usual metal 3D-printing processes usually involve metal powder and a plastic binder.  After printing, the green part is sintered.  See this.