#include <Servo.h>
const int switchPin = 8; //active low
const int servoPin = 9;
const int blade_home = 90;
const int blade_cut = 145;
Servo servo;

void setup() {
  pinMode(switchPin, HIGH);
  servo.attach(servoPin);     // connect to servo
  servo.write(blade_home);    // move blade to open position
  delay(1000);                // wait for servo to complete movement
  servo.detach();             // disconnect from servo
}

void loop() {
  if (digitalRead(switchPin)) // when button is depressed upon filament insertion
   { delay(500);              // wait for filament insertion to complete
     servo.attach(servoPin);  // connect to servo
     servo.write(blade_cut);  // move blade to cut position
     delay(1000);              // wait for servo to complete movement
     servo.write(blade_home); // move blade to home position
     delay(2500);              // wait for servo to complete movement
     servo.detach();          // disconnect from servo
     }
}