MPSM Low Filament Sensor holder

Instead of watching my printer while getting close to the end of the roll of filament, I picked up a Low Filament Sensor from EndLessParts.com http://tinyurl.com/j63ecw5 . It’s a fairly simple device that lets out a loud buzzing sound when the end of the filament has passed by it, giving you time to pause the print and change out the filament with a fresh spool. The sensor has two sets of roller bearings that are spring loaded so that when the last of the filament passes through the roller bearings, a contact switch is released by the spring and the buzzer is activated. There is an on/off switch, and from what I can tell, the sensor only uses battery power when the buzzer is sounded.

The sensor comes with four different colored covers and two spacers, one for 1.75mm filament and one for 3mm filament. Mine came with the 1.75mm spacer installed. The sensor is made by a 3D printer and is very strong. The sensor has some double sided foam tape attached to the back of and a couple of ear