This is a knob model that is custom designed for fitting in a cover.On the lower side, there is a circular opening for press fitting to a shaft and used for pulling.The knurling is custom designed based on ergonomics and maximum grip performance.

I have already printed it with a resin printer and the result is great!

The circular opening on the lower side can be customized according to your needs and the model can also me scaled to fit your needs.