https://hackaday.com/2019/08/20/behold-the-crimson-axlefcker-do-not-insert-finger/
It will be interesting when it is printed in nylon…
neat, reminds me of the 2.6 billion : 1 gearbox. possibly also great for making slow motion shredding / extrusion captures 
eventually that could help to get rid of air bubbles during extrusion or use it for an auger based feeder for an injector.
nice, looks promising