I dont get this - you can just print with SMD paste and then reflow the whole thing at once - though you will need high temp materials to do that, but several amateurs have done it.
Afaik there are a lot more high temp UV resins you can print with.
Reflowing smd paste inside print won't work reliably as the solder will tend to form blobs instead of keeping the track shape
Reflowing smd paste inside print won't work reliably as the solder will tend to form blobs instead of keeping the track shape