Behringer UM2 knob extender

I mount my UM2 upside down on the underside of my desk, and wanted a knob I could find blind. This just snaps over the top of the existing knob and works pretty well.

I think the texture looks kind of ugly so I included a smooth version as well. Easy to change it too, if you look in the source file.

Onshape source: https://cad.onshape.com/documents/648d8d317fdeba52a246b1b9/w/fe6f4036fe6999dc0687b339/e/6b16dbc2fe2e84a822909857?renderMode=0&uiState=62eb2b8bc21ec068bef826ca