Look at this miniature 3D-printed LEAP-1B turbine jet engine

I think this would be pretty neat to have on my desk. You can see some schematics and build info over at rcgroups.com forums. This model is 100mm in diameter with 18 fan blades and a working thrust reverser (shown in the video). So cool.

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Wonderful video shows reverse jet engine thrust up close and in slow-motion

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