This is a switch topper for guitar pedal switches (and other pedals that may not strictly be guitar pedals). It's especially useful when you are playing at home with bare feet and don't want to put shoes on. It's also useful if you want a better hit target during live performance and you can print in any color you want. This version is for a standard 10mm switch and should fit snug or a little loose depending on the particular switch. Inner diameter is 10.1mm
If you've got pedals with an odd sized switch or need to adjust tolerances based on your printer or switch, I've made this a parametric design you can edit in OnShape.
The link is here:
https://cad.onshape.com/documents/a62e3752578b660c59f633a1/w/d76c850124a9afd0edbd088a/e/1618d9827f567a83c00a958b
If for some reason the link doesn't work,. you can search for 'Pedal Switch Topper'
The author hasn't provided the model origin yet.