My alternate version of the rubber wiper with 3 sharp edge brushes and vertical sides.

I had problems with filament strings getting stuck and hanging on the slope of the original design and i wanted to have more brush edges with sharp edges, thinking that it would make more effective cleaning.

I have now used it for a number of weeks with different material, PLA, PETG, PETG-CF, ABS, and PC and the nozzle has cleaned really well in all cases and no filament strings gets stuck on the wiper, either inside or on the sides.

I have uploaded my version of the mold to make this wiper from silicone.