This is a fun boat that's propelled by a drop of soap. 

To use place a drop of soap in the small reservoir on the top of boat and gently place on top of still water. 

Make sure that parts of the boat don't get covered in water. The soap will meet the water at the small notch in the reservoir and as it breaks the waters surface tension the boat gets propelled. The rounded front lets it turn around corners. 

If for some reason its not going straight you can bend ever so slightly the tail end at the notch in either side to compensate with a small drag.

This is a quick print and takes about 10 minutes. 

This is a delicate piece so take of the build plate carefully without bending. Also wait for the print bed to cool down before you take it out. 

Added a variant with more ridges so more soap contacts water and makes the boat go a bit faster.

boat in action

Enjoy!