Ultimaker Extruder Removal screw
thingiverse
It helps to clean the drive shaft after many many successful builds. Center is a M13 hole that encloses the nut. Its a derivative of http://www.thingiverse.com/thing:8190 http://www.youtube.com/watch?v=TGXkQ0qusIg http://www.youtube.com/watch?v=ShVZJ9ULa7g
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