Actually, 3d printer is a tool that&#x27;s currently cheaper and more widely available than milling machines - the whole point of this is &quot;hey, of course anyone with access to CNC or the skill to operate a manual milling machine could do it, but that&#x27;s only a small niche, but now every idiot with access to a 3d printer can do it&quot;.<p>People and shops that are <i>below</i> the range of a moderately equipped machine shop can do 3d printing; a 3d printer that can make such a key from hard plastic costs less as a cheap manual milling machine that can make a similar key from metal and requires less skill to operate.