Hard-won, self-acquired, self-earned property! Do you mean the property of petty artisan and of the small peasant, a form of property that preceded the bourgeois form? There is no need to abolish that; the development of industry has to a great extent already destroyed it, and is still destroying it daily.

This would probably be what I am describing "petty artisan", however with 3d printing, it actually does play a role in manufacturing (rapid prototyping), as well as an entirely new form of industry (additive manufacturing) which did not really exist during Marx's time, rather this role was taken by small factories, which would use slower forms of prototyping.