When your old vertical window blinds start falling off the retractable because they are brittle and broken from the sun and you can't buy them anymore this is your answer.
This one suits the standard wide blind that is approx 130mm wide.
as the top hook system is pretty much a standard hook design, these should work for most of the wide brands.
eg: Vista Blinds

printed in ABS as not to sag with heat
0.30mm Z
with 2 outer 3 top and 3 bottom
infill % wont matter as the print is only 2mm high - (infil wont be printed)