Originally Posted by
Bezalel
For three of the four sizes Velocity lists an ERD 19mm less than the ISO size, the other one is 18mm difference. In theory the difference between the ERD and ISO size should be consistent for the extrusion regardless of ISO size.
I'd guess 432.
Bingo!! 432 is what I got, doing it FBinNY's way...Really i needed a number for reference (paranoid since this is first build) hence wanted the published data. I've contacted velocity but haven't heard back from them yet. Again, Thanks everyone for their input.