Truck air control knob

The Engineering Drawing (Sketch)

• Main Dimensions: The outer circle has a diameter of 40.10 mm, with an inner edge of 38.90 mm, suggesting a wall thickness of 0.6 mm.
• Symmetry: A central structure with a circular hole (diameter of 10.00 mm) is observed, designed to fit an axle or potentiometer.
• Design Guides: Blue lines and auxiliary circles show how the width of the top part (the "grip") was calculated. It has a central width of approximately 13.30 mm on each side of the axis.
• Constraints: Small icons (such as parallel and perpendicular lines) indicate geometric constraints that ensure the piece is perfectly symmetrical.

2. The 3D Model (Render)

The second image shows the piece already extruded and converted into a solid object:

• Base: A low cylindrical disk that matches the 40 mm measurements from the drawing.
• Grip Body: An elongated protrusion with rounded edges (fillets) to make it comfortable to the touch.
• Visual Indicator: It features a vertical white line on the front. This is the position mark so the user knows the control level (on/off or intensity).
• Environment: It is placed on a "grid" or work grid of a slicer or modeling program, which suggests that it is ready to be 3D Printed.