Push-Button Ratchet Mechanism

Create a simple 3D-printable push-button ratchet mechanism. Pressing a button once should rotate a circular wheel by exactly 30 degrees, then lock it in that position. Releasing the button should return the button to its original position without rotating the wheel backwards. Use a ratchet wheel with 12 teeth, a driving pawl connected to the push button, a holding pawl to prevent reverse rotation, and a return spring or flexible spring arm for the button. The wheel should rotate around a central axle. Design all parts as separate components with realistic clearances for FDM 3D printing. Keep the mechanism compact and mechanically simple. Do not use electronics, motors, gears, or complex mechanisms.

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