Let’s call them window sliders

my thought exactly. i'm not a tech savy guy but i;ve seen enough about those 3D printers to know it would be a easy task to copy the originals and print them were not talking rocket science[maybe we are].the ones they are selling have those little plastic tits on them like a injection molded piece there would be the problem there mold is wrong. but that doesn't seem to keep them from selling them for 125 dollars