Indeed, if your machining tends towards the miniature, consider building yourself a series of tiny ... relying largely on 3D printed components. They’re all powered by basic DC brushed motors ...

A servo is used to push the canister into a 3D printed housing, releasing the gas into a pipe to guide the fuel towards the end of the user’s wrist. The fuel is then ignited by a heated coil of ...

In both instances, you can select its colour, from black or grey, and don't need a 3D printer. The biggest reason to buy from ...