sometimes 3d is best with a straight bit.

[knight_toolworks]

if you are doing 3d with with a single curve direction or slope I find a straight cut bit does a much better job. Plus you don't need as smell of a stepover. 12% or more is fine. I am cutting these with a straight bit 12% stepover and at 8ips. you don't even have toolmarks to deal with.
http://i154.photobucket.com/albums/s266/knighttoolworks/posting/F46A1FFB-orig.jpg

[Brady Watson]

That's just an angled plane, isn't it?

-B

[knight_toolworks]

That's just an angled plane, isn't it?

-B
slight curve. I have done some pretty steep cuts with the single angle with a straight bit.