1. It has provisions of Cartesian robots and extruder 2. Expand to control parts 3. MOSFET heater / fan output and three thermistor circuit 4. 5A extra safety and components protection 5. Extra bed heating control 11A fuse 6. Suitable 5 Pololu stepper driver board 7. Pololu board pin socket so they can be easily replaced or removed for future design 8. I2C and SPI pins left for future expansion 9. All MOSFET PWM pin is universal 10. Servo connector for connection to the end stop the motor and the light-emitting diodes 11. LED indicates when the heater output 12. Option 2 motors connected to Z Prusa Mendel