Design Help - How do I design the red shape so that there is just 1 blade for the center line on the cutter?

[sucorra]

[CookiecadNathan]

It may be a bit of a challenge to get the thickness exactly right but if you make the red part in the center thinner then the two walls will move closer together and merge into one.

[sucorra]

Thanks - .015 inches seemed to do it for me.