Stacking Threaded Bowls

Bowls with male and female threads that can be threaded together to make a stack. A lid is also included that can also function as a bowl. 

Current size is 20mm depth by 100mm internal diameter. I initially designed these to hold different colored D6 dice. They can however be scaled to suit different purposes.

Print the bowl and lid with the flat side on the print bed. No supports needed, 0.15 layer height, and infill shouldn't matter. Depending on the quality of prints, the threads might need to be cleaned up a little for better engagement.