Easy to remove mount for Tarot T-2D Gimbal, the second (smaller) piece slides into the main one.
Print it at 75% (or more) infill, to make sure it has enough strength. I printed mine at 80% infill and it has 41 grams (both pieces).
Print with support.
You need to do some filing to make it fit into each other.
I uploaded the sketchup files if you want to modify for other gimbals.