Ok guys what am I missing? I was able to get toolpaths for the crown, but now, all I am getting is a .nc file and the marlin firmware from TT doesn’t use .nc. Where do I go from here?
Rename the file?
Seriously, open the file in a text editor and see if it’s just gcode. If it is, rename it to _____.gcode
Tried that 
What’s in the .nc file?
All gcode.
Then you should be able to rename the file (make sure you’re changing the extension, not just changing it to filename.gcode.nc). I’m also assuming that .gcode is the correct extension… 
Haha. Ops. Old man moment.
Problem solved.
Now another issue. My machine, with that code, continues to move forward in the y direction and dowsnt stop.
Is it a mm vs in issue?
Post the first chunk of the gcode it produced and let’s see what’s going on.
(1001)
(T24 D=1 CR=0.5 - ZMIN=-1 - ball end mill)
G90 G94
G17
G21
G28 G91 Z0
G90
(2D Contour5)
T24 M6
S25000 M3
G54
G0 X97.957 Y66.952
Z15
Z5
G1 Z1 F500
Z-0.9
X97.963 Y66.947 Z-0.938
X97.981 Y66.935 Z-0.971
X98.008 Y66.916 Z-0.992
X98.039 Y66.895 Z-1
X98.121 Y66.837 F800
X98.157 Y66.822
X98.196 Y66.821
Now that I look a bit closer, somthing tells me I shouldnt be using the grlb. So if I’m right. What post process should I be using in fusion 360 ?
Check out the one linked at the bottom of milling basics. It is written by guffy.
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Now even bigger issues. All I get from the crown test is large circles…