https://www.tamiya.com/japan/products/70235/index.html
https://www.tamiyausa.com/shop/educational-construction/rack-pinion-gear-set/
This set can be used to manufacture a rack and pinion mechanism that converts rotational motion into linear motion using gears. The pinion gear attached to a 3mm hexagon shaft such as a gear box has a clutch that protects the motor and gear when a large force is applied. It can be applied to various types of work, such as a forklift-like movement or sliding the gear box itself. By combining this with a fun machine series universal arm, you can further expand the ingenuity of movement.