3d printing sand casting patterns

[DeltaCharlie]

Ran across an interesting youtube video by Roberson Foundry. Instead of using a split pattern he used one 1/2 pattern and a full pattern. He rammed up the 1/2 pattern in the drag then pulled it out and then inserted the full into the drag to do the cope on top.

Because 3D printing can make very accurate patterns this is doable and for symmetric parts this seems like an interesting option.