3D Model: Design A Compact Mechanical Wind-up Timer That Can Fit Inside Or Encase An Underground Mineral Reader Tube: A Gray Metal Cylinder ~1m Long With Expandable Curved Fins At One End Like An Anchor/grapple, Wrapped In Tape/band, Used As Overshot In Wireline Drilling. Timer Is A Music Box-style Counter With Manual Wind Knob, Internal Spring (plastic Coil) Unwinding To Track Minutes/hours On Analog Dial. Made Entirely Of 3D-printable Plastic (PLA/ABS) For Lightness, Durability, Corrosion Resistance; Smooth/matte Finish (gray/white), Faint Layered Texture, No Metal/rust Look. Optimize: Precise (clear Markings, Anti-vibration), Rugged (humidity/shock-proof), Ergonomic Knob/visible Dial, Eco-friendly, Seamless Integration Without Hindering Function. Provide: Step-by-step Design Description, 3D Print Instructions (STL Files, Settings For PLA/ABS). Generate Realistic Conceptual Image Of Plastic Timer Inserted In Or Covering Tube In Mining Borehole Environment.