Great Toy for toddlers. My son absolutely loves it hence the little Jon being on the face of the hammer. the stl you'll be getting doesn't say little Jon on it. Definitely loads of fun for the small ones. The Hammer and nails work great with foam you can get from your local hardware store or walmart. Includes 2 different sized nails. Hammer is 198 mm x 89 mm very useful size i recommend printing with atleast 50 percent infil honeycomb would definitely be the best choice.