Calibration test box with internal sphere - Dual extruder

This is my test setup for checking if I could print these for my dual filament guide project.

If you print this, please post a picture on the 'I've made one'. Thanks!

Put three test boxes down then insert the different size spheres. Print three at a time and compare the results.
The box has a 9 mm radius sphere pocket. The spheres come in 3 sizes; 8 mm, 8.4 and 8.7.

The inner sphere should rotate 360 degrees on every axis when done.