Customized version of http://www.thingiverse.com/thing:1358361

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1358361

Using the following options:

knob_handle_thickness = 4
knob_base_rounded_height = 2
pin_diameter = 6.5
knob_diameter = 24
knob_height = 15
knob_base_inset_height = 3
knob_base_cylinder_height = 3
knob_handle_rotation = 0
shrinkage_allowance = 0.25
pin_height = 8
pin_double_sided = no
pin_diameter_flat = 5.3