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$100 Exoskeleton Arm (ExoArm)View Instructable »
Smartphone Controlled Helme...View Instructable »
How to be a smart hardware ...View Instructable »
Can't really say. There was a lot of trial and error, so I'd say about 400 EUR, maybe more.
Fidget CubeView Instructable »
Thanks! Much appreciated! It's really not that agile, because I'm using soft props and you can hear vibrations when doing hard turns. Also it should be smaller. :)
Quadcopter and DIY Flight C...View Instructable »