This is a super simple model of the famous triangle puzzle, where you need to add a small white square. Print it out and show it to your friends to see if they can figure out how to put it together. This is a very simple 17-gram design that's easy to print and can be printed in the colors you want. As you can see in the video, the parts fit together perfectly without needing to be fastened. If you want to know the answer, visit my Instagram: 3d_rivas, where I'll post a video with the solution.