Concept

I have do some explore about multi-material 3D printer(I call it DM)which can print plastic(PLA or TPU),and metal(Sn) in one model. . In the meantime I do some basic practice about computer control engraving machine in MECHANICAL DESIGN &BUILDING week I found the core point in this project is how to control the metal extrude. In Professor Neil 's advice. My finial project's topic change to 3D printing nozzle for Sn.

Key function:

• My own board( contain ATmega328p) to control the machine;
• NTC Temperature Sensor get the temperature of hot end;
• Relay control the running of hot end;
• A4988 Driver to control a stepper motor and then control the running of Solder wire;
• Improve the hot end;
• Design new coolant system to control the temperature of machine

So I design the structure as the following video

Practice

In the following time, I would practice it and test it.