About this 3D model

The previous bowl has a screw-on top I had to change the shape to circular. I also increased the diameter a bit so it would hold more stuff. The thread is a single helix, so to attach the top you have to have it lined up properly with the bottom. I am going to see if attaching the top is easier if the threads are a double or triple helix. The top does print OK with no internal supports. With a layer height of 0.200 mm and a print speed of 100 mm/sec the top printed in just under 11 hours, and the bottom in 27 3/4 hours.