Drive pulley / wheel

The drive wheel for the Van der Graaf-generator in my physics laboratory was broken. I was unable to find spare part and I was not able to find a suitable part here. Most pulleys are for drive-belts, not o-ring type rubber bands (round) that this apparatus has.
Uploaded a photo of broken part to chatGPT (o1) and it created the part for me in SCAD-code. After som tinkering and adjustments I got it right.

All parameters are simple to change in the SCAD-code with no prior knowledge.
With my printer I found that 6.5 mm axel hole was a good fit, even though the axel is 6mm in diameter.

To view and adjust the part I used OpedSCAD. Simple and intuitive (press F6 for rendering, F7 for exporting as STL or F8 for printing)


Adjustable parameters with default values

// Main adjustable parameters:
outerRadius = 10; // Radius at the largest outer edge (10 => Ø20 mm)
totalHeight = 20; // The overall "tallness" of the roller
axleDiameter = 6; // Hole diameter for the