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 = 2.6
knob_adapter_width = 6
knob_height = 6
knob_adapter_height = 6
knob_support = no
knob_width = 14
knob_adapter_structure_fine = yes
knob_adapter_structure = yes
knob_wall_stripes = 12
knob_support_height = 0
knob_wall_stripes_size = 0.6