Some existing 3D printing techniques already support this with dual-materials (where the support material is dissolvable easily). I guess the advantage of the O

Some existing 3D printing techniques already support this with dual-materials (where the support material is dissolvable easily). I guess the advantage of the OP approach is that the printing can be much faster (albeit with the tradeoff of precision due to the gel (see other HN comments here) and speed) due to (a) The extruder not needing to extrude extra support material (b) The support structure of gel may be allowing for much faster extrusion.