I liked the original filament guide but thought the connection between the 2 pieces could be a bit stronger. So I fused them together.
Print standing with a raft - I tried without one but it didn't stick well enough.
Should print without supports but if you enable supports you might get a slightly better finish on top.
I have a cable cover on my 5/16" Z-brace and don't even need a screw, it's a tight fit.