As far as the finish goes I’m going to primer it, then of course the usual black and yellow followed by a few coats of clear lacquer. It’s just MDF so I’m not concerned with showing the wood on this one.
I honestly don’t remember exactly since I did this probably a year ago.
But both passes must have been 3mm endmills.
The stl I got here:
Feeds & speeds I can’t recall but for smooth finishes i always use 5% stepover. It takes a bit longer, but hardly needs sanding afterwards, if any. I didn’t sand this afterwards. Note that since then I squared my machine and leveled the Z-axis so that is why my flats weren’t completely … well… flat…