This script lets you generate a encoder knob.

If you've never used openscad before, here are some basic instructions to get you started.

1. Download knob.scad

2. Download and install OpenSCAD

3. Open knob.scad using OpenSCAD

4. Edit the first few lines of the script. The comments explain what each variable does.

5. In the menu, press Design > Render

6. In the menu, press File > Export as STL (ascii)

You now have an STL file that you can bring into a slicer to print. 

The variables for an Audio Engine A5+ volume knob are:

shaft_od = 8.9; // outer diameter of mount cylinder

shaft_id = 5.8; // inner diameter (encoder shaft)

shaft_depth = 5.0; // how far the mount extrudes from the body