A screw-together wall plate that goes through a single 3 inch (7.5cm) to 6 inch (15cm) thick wall and provides a path to pass cables through. Mark and cut out both sides of the wall. The "inner" side will need to be drilled slightly thinner than the "outer" part side. I provided two versions, one with a 36mm (1.4 inch) inner diameter and another with a 50mm (2 inch) inner diameter. Both need 0.2mm tolerances from your printer. Print with the large flange side face down on the bed.

Fusion 360 file provided. Mostly it is parametric, though you'll need to adjust the two thread steps to a thread size that fits based on the inner diameter and thickness you choose.