   digitalWrite(SPL_PIN, LOW);
   digitalWrite(HTR_PIN, LOW);
   digitalWrite(ENBL_PIN, LOW);
+  digitalWrite(HTR_LED, HIGH);
+  digitalWrite(HOT_LED, HIGH);
   delay(6000);
   digitalWrite(ENBL_PIN, HIGH);
 

byte spl_kp = 0;
byte spl_ki = 0;
byte spl_kd = 0;


// Serial variables
byte serialBuffer[256];
byte heater_activated = 0;
byte motors_activated = 0;
int current_temp = 200; // in degrees celcius 
int current_diam = 1750; // in micrometers


const byte HOT_LED = 6;


// Extruder motor globals
boolean extruder_active = 1;
byte ex_power = 70;


// Time related
