Instructionsonce printed take your old feeder apart and use a standard nut (not one with a lock thread) plop the bearing on and away you should go. ITs a little tight getting it in there but it works nice. BTW make sure you print it with 100% fill.. anything less will crumble under the pressure that is needed to push the bearing against the filament. One note I added little black dots to the out side of the bearing with a sharpie about 15-20 of them . Reason is so through the gap I could look in and check to see if the bearing was moving. (flash light needed for this) Great way to see if your actually getting movement on the print or not.