Model of Y-shaped pipe

I’m new to SketchUp and 3D modeling. However I need to prepare model of Y-shaped pipe and 3D print it. I tried to follow this topic: Making a Y tube (manifold) and obtained attached model, although I see a lot of unnecessary edges on my model and I cannot find a way to merge parts of it. Is the model I’ve created suitable for 3D printing? And is there a way to smooth it? I know these are probably really basic things I could solve it with some research but this is pretty urgent case for me. Thank you for any help.
Y-pipe.skp (519.7 KB)

create the path and base circle on axis, unlike your example…

use ‘solid tools’ to remove unwanted portions…