Should fit the portafilter for most Rocket Espresso machines (e.g. the Giotto, Cellini, R58, I think all use the same portafilter handle and basket sizes). It should fit the dual spout as well as the single, although of course you don't really "need" a stand with the dual spout. Correction: it doesn't fit the dual spout - I forgot the dual spout isn't a single casting but has the dual spouts as a separate piece that screws on, so the dual spout interferes with the cone support side of this stand! It probably will not provide enough support for a bottomless portafilter, but it might ( Edit - yes, it does, I checked). It might also fit other brands that are based on the E61 brewhead, but I make no promises.

If anyone wants the original design files to play around a bit more, please let me know; this was drawn in Creo Elements before the export to STL. For example if you wanted a bit more radius blending where the horizontal tie bar connects to the arc section supporting the basket, to increase the strength a bit. Then again, you can also vary the strength quite a bit with infill parameters.