Invention Designer is LEGO set 20215-1. It doesn't have a score so far. The set is recommended by 0 reviews, based on 1 scored review and 3 reviews total. We know this set was released in 2013, and it is categorised in Master Builder Academy.
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As regards to the Invention Designer set as a whole, I thoroughly enjoyed building everything that was included in the three books as well as all the springboard models online. I learned a lot of new techniques that I haven't done before and will probably implement some of these techniques in my future creations. This set is a great addition for anyone who wants to learn more LEGO techniques to their arsenal.
I'm not going to give this set an “out of 10" rating because there's no specific model you're supposed to end up with. Rather, I'm just going to give this set a general “recommended" rating because I really like the book/parts tutorial combination. There's a lot to learn in here about how to get a detailed building going. If you're into the Modular Building or Architecture themes and you want to start designing your own, this set could be a good starting point for you.
I will say that this is a hard sell because of the price: $80 U.S. The manuals are very nice, though, and I think a new Lego builder could have a lot of fun with them if he or she wanted to develop some professional-grade building skills. They'll also look really nice on a shelf.