Printed in two sections not requiring support, with interference fit that also negates glue.

I printed the example at 0.28 layer height with two walls and 20% infill. I think it would be better at 0.20 layer height with four walls.

Later I added a new file that includes the entire model, based on user feedback.

Still later I added a version that has a taller Body2, based on user feedback. Modified the connection tabs further; they were 5mm too tall. Changed in v8. Also, I think there is no interference fit on the tabs on the taller version; they will provide alignment but probably will need some glue.