All blades have the same size, 36cm long, aerodynamically well shaped. But. The first weighs 120g, the second 125g… And the third one 210g… This is a small problem. So what are my options now? Making a new blade would be the last option, but do I have any other options?
Maybe I am missing something, but just adding weights to the lighter blades to balance everything out seems be the solution.
There are lots of how-to’s out there for how to balance ceiling fans with weighted clips, you should be able to adapt the process to your specific needs.