A knob finishing off my Pixel Clock (see: http://jh-interact.blogspot.nl/2016/02/pixel-clock-introduction-preview.html)

The knob is customizable in different ways:

• Choose from base shapes cylinder or flower.
• For a cylinder you can choose the number of vertices to create a triangle, square, etc. Then a number of cylinders are subtracted.
• The flower shape consist of a number of cylinders, 'convex hulled' from the middle.
• Hole size to fit different axles. Provided are D-shaped and cylinder ('normal') shaped.
• And the depth can be adjusted for different sized axles.

A few examples are provided. Have fun!

"4-way ninja star" SHAPE = "C"; CYLINDER_R_OUTER = 26; ROUNDING_R = 1.5; C_FN = 4; C_CUT_NUM = 4; C_CUT_R = 10; C_CUT_OFFSET = 15; C_CUT_FN = 5; C_CUT_SCALE = 1; C_CUT_ANGLE = 36;

"moon" SHAPE = "C";
CYLINDER_R_OUTER = 26; ROUNDING_R = 1.5; C_FN = 12; C_CUT_NUM = 1; C_CUT_R = 15; C_CUT_OFFSET = 22;
C_CUT_FN = 12; C_CUT_SCALE = 1; C_CUT_ANGLE = 15;

"star" SHAPE = "F";
F_NUM_LEAFS = 5; F_LEAF_OFFSET = 25; F_LEAF_R_INNER = 4; F_LEAF_R_OUTER = 1.5;