Simple attachment to take 54mm espresso portafilter for the starseeker edge+… I couldn't find one easily online and it was a simple shape to mimic. Seems very sturdy and it holds the portafilter well.
My model might be different than yours. Ali express hardware seem to share model names between revisions. Works great with a 54mm portafilter + dosing ring (tall). I'm using the normcore portafilter (I think) but i'm guessing this would work with more (maybe with small model tweaks).
The author marked this model as their own original creation.