Basics

An Abbreviation for Selective Powder Deposition
A form of metal 3D Printing
Uses a crucible that is filled with either filler powder or metal powder
This is then put in a kiln with filler metal above which seeps into the metal powder, but not the filler
Thus it casts a precise part (No shrinkage like sintering methods)
May not be better than other methods (Mig 3D Printing, lost pla casting, 3d printed part to greensand casting etc), but it is worth looking into
Also may aid as a development tool for working with powders in a cnc enviroment
May be useful for other powdered materials

Existing Development

This group seems to be the main, if sole developer: