Shower Handle Knob
thingiverse
I'm throwing this out there in case someone might find it helpful, no guarantees though. You'll need a replacement for a 1.5 inch diameter cap, which can be printed sans support material. If anyone makes one, feel free to share the outcome!
Download Model from thingiverse
With this file you will be able to print Shower Handle Knob with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Shower Handle Knob.