Marble Escalator

The model is a marble escalator. When spinning the hand-crank marbles that role in through the inlet comb are transported upwards on the escalator. They roll out through the outlet comb. Inlet and outlet comb has rail sockets compatible with gravitrax from Ravensburger. 

The assembly requires the following metal parts:

| Item | DIN / ISO purchasing reference | Used | Suggested purchase quantity | Purpose |
| Solid smooth steel dowel pin, Ø2 × 30 mm | DIN 7 / ISO 2338 | 20 | 30 | One per belt hinge |
| Straight smooth steel shaft, Ø5 × 80 mm | No specific standard required; smooth round stock | 2 | 2 | Upper and lower shafts |
| M3 × 6 mm socket-head screw | DIN 912 / ISO 4762 | 3 | 5–10 | Three shaft collars |
| M3 × 8 mm socket-head screw | DIN 912 / ISO 4762 | 8 | 10 | Two per bushing flange |
| M3 × 10 mm socket-head screw | DIN 912 / ISO 4762 | 3 | 5–10 | Two sprocket clamps and crank clamp |
| M3 × 12 mm socket-head screw | DIN 912 / ISO 4762 | 4 | 10 | Four independent foot screws |
| M3 × 25 mm socket-head screw | DIN 912 / ISO 4762 | 1 | 2–5 | Fixed crank knob mounting |
| M3 × 50 mm socket-head screw | DIN 912 / ISO 4762 | 4 | 5–10 | Two comb mounts and two cross-spacers |
| Plain M3 hexagonal nut | DIN 934 / ISO 4032 | 23 | 40 | One per screw, including captive clamp nuts |

The model, the animations, and the manual were made with generative AI, GPT6.1 Sol. The model was printed, tested, and refined.