For these presents I combined several techniques. I used Solidworks to create the 3D objects. Then I ran a fluid simulation in Blender with the 3D objects. I picked the frame I liked best and exported the .stl file to be 3D printed. Unfortunatly, I don’t own a printer that can do multiple colors (yet), so I painted the models by hand.

Below you see a rowing blade entering the water. This present I made for my rowing buddy.