The PEI (Ultem) is the actual top of my print surface. Currently my PEI sheet is attached with 3M tape to my Aluminum build plate.

I totally agree with you regarding eating up too much Z-axis height. I was trying to avoid using thermal paste because of how messy it can be, but that could be an alternative. My goal is maximum heat transfer to the print surface.

Quote Originally Posted by TiredJuan View Post
I would leave that area alone. Kapton won't do much to dissipate the heat, and while it may slow the heat process down a bit it doesn't take up much room. Using silicone transfer pads takes up quite a bit of Z-Axis space, and every millimeter counts.

(For clarification, what is PEI in your diagram?)