What feed/speed are you running each of those bits, John, and how much stepover and stepdown do you increase with each pass? I assume the 'high detail' setting is a choice in Aspire and probably gives less stepover and stepdown with each pass. In Fusion 360 I have to set all of that but generally run 18k and 0.09375" depth at 100-150 ipm on the 1/4" (spiral upcut two-flute flat end bit), haven't done any enough 3D to know how Fusion 360 treats stepover. Most of what I have done is contour/profile cutting so it's just stepdown to be factored. I usually run the same style 1/8" bit at 50 ipm and 0.0625" stepdown but the same RPM.Rough cut was an hour and change and the finished cut was about 3 hours using a 1/4 inch ball nose set on high detail. Could have gotten a little better detail using a 1/8 ball nose, but that would have added a few more hours to the finsh cut.