Customized version of http://www.thingiverse.com/thing:580150

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=580150

Using the following options:

knob_wall_stripes_size = 0.8
knob_width = 18
knob_adapter_structure_fine = no
knob_support = yes
knob_height = 16
knob_adapter_structure = yes
knob_adapter_width = 5.9
knob_adapter_height = 0
knob_support_height = 0
knob_wall_stripes = 14
knob_wall = 2