This conector takes a 2cm conduit there are two versions one is friction fit the other lets you use a zip tie to make sure its fully atached i considered a grub screw version but in reality no one use it due to the dificulty of accses so if you want it to look realy neat use the one without cut outs if it doesnt stay on properly hot glue should fix it
If you print V2.3 with out supports on, then the bridging may cause some arterfacts in the form of splureged philiment before building up enough filiment to do a clean run if you get this on your print its worth seeing if this artefact acts as a latch on one of my test prints it acted as a verry efective sprung latch. An example of this spring effect can be seen in the photos
The author hasn't provided the model origin yet.