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My apologies.
Digging into it, it's because of a few settings you had in your 3D milling passes.
For starters, your part has fillets, your endmill of choice is a sharp corner
For the walls: (cut #8)
You had "Ignore Cusps" and Adjustment Offset was set to .020
I set it to:
Machine Cusps, Adjustment set to zero
Your heights tab was actually set to stay .187 off the bottom of the floor. Intentional?
For the floor: (cut #9)
Same deal on the Cusps and Adjustment Offset. It was staying .020 away from the wall
Side note: I see that the side walls on the top of the finbox_holder are at 89.9 degrees. Intentional or not enough sketch constraints? Only reason I found that out was because I wanted to make a recommendation. If possible to use, 2D can sometimes be a more efficient toolpath and more easily controlled where and where it does not go. For the sidewalls, I'd quickly set a 2D contour pass and call it good. Floor? I'd figure out a pocket or simply a 2D contour routine with multiple passes. Your mileage and needs may very, but just food for thought. Fusion does offer some simple tools to get stuff done, just got to figure out how to apply it
Seth Madore
Owner, Liberty Machine, Inc.
Good. Fast. Cheap. Pick two.
Fusion