Why not use a lost wax method? - create wiring trace layers out of PLA/ABS or other direct printable material(with sprue for positioning/shape maintenance). - cast plaster or other ceramic material around a layer, - Repeat 1st 2 steps for multiple layers, letting the cast set - thoroughly melt out printed traces - fill with solder (a bit tricky, unless the solder happens to bind nicely to thby TomC - RepLab Working Group