This could be either a cup or a bowl - take your pick. It is actually a combination of 2 separate shaped (the top and the base) combined with a series of twisted pipes for decoration. The overall design was tricky because of the overlapping shells require to make it solid. To reduce the amount of infill required I employed a trick that you can see by looking at the bottom of the final print.

This part printed in a little under 19 hours using a print speed of 90 mm/sec and a layer height of 0.200 mm.