Hmm, I completed a mini game several times but can't complete the game. Every time I pass by blue sensor it says 'You get blueprint', but after that it adds 'You can't have that'. So, I never get the blueprint. Is there maybe maximum number of items in inventory? I have 3 items in inventory atm, and maybe I can't get blueprint because I can't have more than 3 items? But, I also can't drop anything from my inventory. Well, I'll play from start trying to keep inventory less than 3 (in case that's the problem).
EDIT> Yeah, when I had two items in inventory I was able to complete mini game and receive blueprint.