One would actually need 3 connections on at least one side to keep the extruder parallel to the plate. Two of the delta connecting rods would always form a parallelogram with the extruder plate. The other side could be 180 degree rotationally symmetric, so 6 arms in all between the sides and the extruder plate to keep things parallel.
And it would definitely need delta-style extra hight to get cartesian-style z-build volume. But hey, belts are cheap, a little extra extrusion would not cost that much more.
[attachment 35482 HybridDelta.jpg]
And it would definitely need delta-style extra hight to get cartesian-style z-build volume. But hey, belts are cheap, a little extra extrusion would not cost that much more.
[attachment 35482 HybridDelta.jpg]