I made my own spool holder, because I did not prefered the factory flat one.

1st step:

Screw out the factory top filament spool holder and push on the "Base" model onto it. I made a hole on it to get easily screw with the factory allen tools.

2nd step:

After you screw back the top, slide onto the "Outside" part to the base.

3rd step:

Clip on the holder ring onto it

4th step: Enyjoy :)

I added a bigger diameter clip too, if you worried that the filament will fall down you could use that also.

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3D PRINTING SETTINGS           

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To print the base without any support, print it face down as the cura photo shows.

0.2 mm layer height

no supports

I printed in 350mm/s with the V400 without any problem.