Knob then widen

The requests, in order

1The attached photo shows a knurled knob from the side, standing on its base. It is 38.13 mm across at its widest. In the top face, which the photo cannot show, there is a blind bore: 9.5 mm in diameter, 10.64 mm deep, with a flat on one side of the bore 8.58 mm from the opposite wall, the flat facing +Y. Make one that matches the picture: the same proportions, the chamfers at both rims, the knurl, and that bore. Z up, the knob standing on Z = 0 with its axis on the origin. Name the sub-part `knob`.

2Make it 20 % bigger in diameter, keeping the height, the chamfer size, the knurl and the bore exactly as they are.

What the AI judge checks

• The overall form matches the reference: the same kind of object, the same silhouette from the matching angle, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
• Proportions match: the relative sizes of the major dimensions agree with the reference within what the eye can judge, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
• Every major feature visible in the reference (holes, slots, bosses, tabs, lips) is present in the result, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
• Those features sit where the reference has them, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
• Nothing is present that the reference does not show — no decorative or unexplained geometry, allowing for the requested change: 20 % larger in diameter than the photo, height and bore unchanged
• The hole in the top is the same size as before — widened around it, not scaled with it

Measured checks

• watertight (gate)
• one sub-part named knob (gate)
• diameter is 38.13 mm
• height is 12 mm ± 10 %
• the bore clears 9.5 mm to 10.64 mm deep
• the bore is not oversize
• the D flat is where the prompt put it
• the flat is not cut too deep
• the bore is blind
• chamfered at the top rim
• chamfered at the bottom rim
• the side is full at mid-height
• the top face is flat out to 34.7 mm
• watertight (gate)
• one sub-part named knob (gate)
• diameter grew by 20 %
• height kept
• the bore is unchanged
• chamfered at the top rim