A parametric D-Shaft knob that is used in a lot of appliances like ovens, hobs etc. 

By default this is for a 6mm Shaft with a 4.2mm measurement from the flat side of the D. Edit the variables in the link below to resize as per your requirements. There is a relief cutout for the shaft to give a flat side for the 3d print.

UPDATE v1.1: Added Chamfers to inner corners of the shaft relief holes. Should print and fit better now.

Model Link: https://cad.onshape.com/documents/e0cc6520ff5d8d08c0d64f4f/w/9e44e29f51875138b195ca55/e/4d6588cfe3790b1aac8702e7?renderMode=0&uiState=68c511c2b4c6a0557b1e3fd4