Character LCD Module 16 char.x2 lines Battery Charger Extruder is the most important

Extruder is  the  most  important  component  for  3D   printer

Y or Z axis

The c communicates over a 1-Wire® bus that requires only one data line (and ground) for communication with microcontroller

SIM900 all pins breakout

Character LCD Module 16 char.x2 lines Battery Charger Extruder is the most important16 charcter 2 lines LCD module with either green or blue backlight Specifications 16 char. x2 lines 1602A character LCD modules Outline size: 80x36x12mm Viewing area: 64. 5x13. 8mm Active area: 55. 45x10. 75mm Dot size: 0. 55x0. 60mm Dot pitch: 0. 6x0. 65mm Character size: 2. 95x5. 15mm Character Pitch: 3. 5x5. 6mm Controller : KS0066U 1602A LCD Data sheet Character LCD Arduino Tutorial