Download them, REMIX them and fill in the lettering, change the lettering to whatever you want. Custom names any size.  The blocks are designed to fit perfectly together with no wasted materials and can print completely without any supports.  I recommend FUZZY SKIN for the LETTER PORTIONS as it's only a .2mm indent.  Prints beautifully on the Centauri Carbon at 4% Grid, 2 wall, 2 bottom, 3 top with Rapid PLA+ or Rapid PETG by ELEGOO!