They probably already did offer spare parts on at least some products if you really wanted them, but shipping is pretty prohibitive on stuff like that.
Also, they take up space in super markets, if they wanna sell them there.
If they just wanna sell them on a webshop, they still have to package and send the parts which costs a lot of money aswell. I think this is the absolute best case, and I (might be biased because I own a 3d printer myself) think 95% of people knows someone who have a 3d printer, that would love to print something like this for other people
They probably already did offer spare parts on at least some products if you really wanted them, but shipping is pretty prohibitive on stuff like that.
Also, they take up space in super markets, if they wanna sell them there. If they just wanna sell them on a webshop, they still have to package and send the parts which costs a lot of money aswell. I think this is the absolute best case, and I (might be biased because I own a 3d printer myself) think 95% of people knows someone who have a 3d printer, that would love to print something like this for other people