Pulley designed for VR cable management. Pulley wheel is designed to take a press fit (by hand) skate bearing. CAD file is in inches but STL files are in mm since that is what my printer needs. All tolerances worked out for perfect functionality and assembly when printed with LCD printer using Siraya Tech Build resin. Has not been tested with other resins or printer styles. Please leave comment for other downloaders on your experience printing this model with FDM or other resins. Thanks.