you will need 4 printsthe 3-24 is versoin 3 with 24mm round leg diameter, the 3-28mm is for 28mm diameter.the diameter corresponds to the original plastic tube ends (black).if you need diffrent diameters you can simply scale the prints.Just in case you want to tip me with Bitcoin:1C7o7HMLkMkZKSZREF4TFEBYX458cf5xy4
Technical
printing worked fine on the classic ultimaker with pla.