A work in progress, At this stage the design works, and the Arduino code works. It basically just monitors the filament of both extruders, So when either one stops moving (Because only one extruder prints at a time), It will detect no movement from either, and so it will sound an alarm. It should work on both single and dual extrusion printers, and is designed to replace the rear large spine bracket. I dont know if it will interfere with the Titan upgrade or not. Currently designing a new pcb to fit to the bracket itself to tidy things up. Im a beginner programmer, and I work full time so the updates will not be as often as I would like. However feel free to shoot me a message and I will try and reply in my time. The arduino code can be downloaded and placed into a folder called NEW_SKETCH, the files are BitaniaTone.h, NEW_SKETCH.ino, pitches.h they have been uploaded.