Ròng Rọc Tham Số (Parametric Pulley)

This pulley is simple and easy to print. The wheel comes in two parts that must be glued together. 
The model files below are usable with a M4x35mm bolt and two interlocking nuts (or use loctite with a single nut). A little silicon grease makes it roll smoothly.

Modify the variables in the onshape design to generate your custom version.
Parameters are:

• Wheel diameter
• Axis diameter
• Rope diameter