Here's a fun little project and was open sourced at https://cloud1.3dprinteros.com

This leg is about 1/2 the size that the inmoov would need, but it's interesting as a start.  The parts were reasonably easy to print, though some did need to be printed with supports. 

3d printed leg

hello kwatter

very nice print

how many time did you need for print it?

what size is it?

have you put a video?

thank you