So we did a test casting of a simple part I had ready for aluminum. I didn’t have anything for a cup around the riser so it just stuck out of the sand and I poured right into it. Melted 10 lbs of clean copper wire and poured borax on top and used a bottom pour crucible. Part filled completely, but I would say it was too cold and lots of poor fusion. Pouring temp was around 2100F. Going to try a sand casting next. Parts we want to cast are flat plaques about 5” square with a 3” tall Roman numeral 1/4” high on each. Suggestions welcome on how we should do this.