XY Plotter/CNC style interpolation project. Need great deal of help

Projects General Guidance
29

  1. i ve never really heard of splines library, i might look at it, though.

  2. getting rid of the

if(digitalRead(xStopMin) == HIGH){
    xIs0 = true;  
    xPos = 0;
    Serial.println("xMin");
  }
  else xIs0 = false;

parts of your code and using interrupts instead. maybe making the switch case part of your code smaller would make it run faster. but serial data is stored in a hardware buffer until Serial.read is called, so it wouldnt matter...i think?