This is a model I made in an attempt to reuse a very large plastic container that held pretzels from the grocery store.

The part is all one piece and should be able to print in place without any supports.

I added a test print for the collar to test and see if your top container will fit once the full part is printed.

0.4 nozzle

No Supports

Printed on a Prusa MK3. 

Prusa slicer will tell you that a toolpath is outside of the path but it was not a problem for me personally.

Recommend printing with a hotter bed (mine was 65) as this model did lift from the bed when I had it a tad bit bigger and the bed temp was 60.