It’s troichoidal, but very safe way to pack parts for MP3DP and mill from a single 12"x12" aluminum sheet detailed here
I used both 1/8 and 1/16.
If I remember correctly, you need the 1/16th for some of the screw holes in the X rail mount on Y Trucks, and I also had better luck getting accurate holes in some places using the 1/16th bit and using the helix drill method instead of just plunging the 1/8th directly down
I probably used the 16th for all of these sized holes
The logos and shaped holes do come out looking better as well…