3D Printed Grasshopper Escapement
I read Dava Sobel's book Longitude just after it came out in 1995. The book tells the story of John Harrison, (1693-1776) the man who created the first chronometer accurate enough to enable navigators to determine longitude. I highly recommend it for anyone interested in the evolution of science and technology. 

Among his many creations was the 'grasshopper escapement' which had such low frictional wear that clockworks he built in his lifetime are still functional today with nearly all of the original parts. I have 3D printed the elements of his escapement and am in the process of using them to build a replica of one of his clocks. Creating the elements was the simple part. Building an accurate clock is proving quite challenging!

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