The problem is common g-code asks for things which violate physics. No amount of engineering or materials science can turn a moving printer head at a right angl

The problem is common g-code asks for things which violate physics. No amount of engineering or materials science can turn a moving printer head at a right angle with absolutely zero deflection. Even giant many millions of dollars CNC machines do all sorts of tricks to make corners (and a million other gcode problems) handle more gracefully. Most such big systems actually read ahead in gcode dozens to hundreds of steps to modify it in flight to get the best performance from the machine.