TortoBot is our 3D printed robot kit for STEM education. It is designed particularly to have very few 3D printed body parts so that students and teachers can 3D-print them in relatively short time. It is powered by low cost common  Arduino electronics. Thus, the whole set is very cost effective and affordable by students .  We open the Arduino program source code for students to learn the robot  programming logic. We share this kit to the Internet,  more details and the 3D print models can be found here.   Students can also develop their own Android app to control the robot. Here is the Android app coding instructions.