Spherical vase / box

The procedure is:
1. load the two vase files into Cura, choose the colour for each and then merge and print,
2. do the same for the dome/lid
3. print the ring
4. glue the ring to the base of the dome/lid making sure the fillets match.
5. fit the lid.

some scraping is needed for steps 4 and 5 as the fit is deliberately tight.