I purchased a vintage wah that was missing the rubber tread on top. Rather than buy one I decided I would try my hand at making one. Here is a blank model for Crybaby Wah topper. Fits snug in the recessed part of the rocker.

I printed mine with no top layers and high infill to add some sort of texture to it.

Planning to try and model the standard style tread based off this one (with pattern and instrument/amplifier labeling)

Enjoy, experiment with infill, and post your makes so others can see the possibilities to make their wah pedal their own.