To make your own 3D design, you can go on Tinkercad and/or take lessons on Udemy, which is a website where you can search a topic and watch tutorials to learn how to do a specific skill. Just go on Udemy and search “Tinkercad”. You should find some tutorials on how to navigate, share, and create designs on Tinkercad. Also, you can go on Thingiverse to look at other designs that people made, get ideas from them, or just print them out in their original form. Soon, you’ll become an expert in 3D design and 3D printing. Good luck, and have fun!