Tuning key top
thingiverse
An initial effort at substituting the plastic handle on my kids' low-cost guitar tuning pegs is described here. As a first-timer, this design might be ineffective; however, I've included the OpenSCAD file for you to customize it according to your peg dimensions.
Download Model from thingiverse
With this file you will be able to print Tuning key top 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 Tuning key top.