Ball in cube (or Rolling Cube)

thingiverse

This project involves using an old can of spray paint with a shaker ball inside and a bonfire. However, it requires safety precautions such as wearing glasses or having acres of land. You'll also need a special permit from various authorities and the ability to find the shaker ball after the can explodes. Alternatively, try printing an open-sided cube designed to fit around a marble or ball you have on hand. Use my .STL file, but adjust the scale according to the size of your sphere. Print with a raft and no support to prevent obstruction. Pause the print at the right moment to drop the sphere inside, then resume printing. The project demands firmware that allows pausing and jogging the build surface, such as Thing #15380 by "jetty". Keep an eye on the printing process to pause it at the appropriate time.