The Dell SK-8135 is my go-to keyboard because it has a physical volume knob. I can get them cheap when they are missing the knob. Here is my take on a replacement. It might fit other multimedia keyboards as well and if not, I've included the Fusion 360 model so you can easily modify it.
I printed in PLA with a 0.6mm nozzle and 0.3mm layer height.
The author hasn't provided the model origin yet.