About this 3D model

There are others out here in Thingiverse but all were too loose on the shaft of the encoders that I had. Mine have a 6mm shaft with a 1.5mm set back flat. My settings (in Makerware): 10% fill 2 shells I had to take an exacto knife to clear out the shaft opening but in the end I had a good snug fit and it works great.