Here is my vision of Leonardo's paddle boat... 20 centimeters long 3D print. Modelled at home with xDesign (Dassault Systèmes 3DEXPERIENCE platform) for a 3D design challenge at my office. Parts printed at Dassault Systèmes headquarters, on Ultimaker s3 and s5... I did the assembly, the device almost works as intended ! I did not win the contest, but had some glory in the Accountings department where I work ! :) The animated model can be seen here : https://www.youtube.com/watch?v=4q3KmYt3pMM