Love Choice claims to be the first DIY chocolate shop in Shanghai. They've been running for 10 years, and now have several locations around the city. They also offer 3D printing on their cakes and chocolates. Lot of animal and heart shaped molds and different colors to choose from in the store. It costs 100rmb to make 80 grams (about 4-5 pieces) of chocolate. You can also order custom shop-made chocolates. For that, it's 80rmb for 80 grams.