Prusa High Flow Nozzle

I was interested in the Prusa High Flow nozzles. I couldn’t find enough information about it, so I cut one open:
 

Prusa worked together with Bondtech and they designed this nozzle for the nextruder. Usually Bondtech is using 3 channels in their CHT (Core Heating Technology). The Prusa High Flow nozzle is even using 4 high flow channels. The filament entering the nozzle hits the tip of the filament splitter and gets distributed into this little chamber. At the bottom of the chamber, there are the 4 highflow channels. These high flow channels are giving better thermal efficiency. You can download the model and can turn it in all directions and see how this looks in detail.

clogged nozzles:
I was wondering if they can get clogged. Their diameter is about 1.1 mm. So it is unlikely that they get clogged. Bondtech is suggesting to only use one nozzle per material, because swapping in between different materials can lead to material building up inside the nozzle.
I am printing PLA, PETG, Nylon, ASA and TPU and also the abrasive materials with glass and carbon fiber. Yes, I had clogged nozzles, but the cleaning needle and the cold pull always solved it.

cleaning needle:

Have you done a cold pull and saw those single strings at the end?

From my cold pulls I see only 3 strings. There should be 4, but don't worry I think all 4 do not fit through the nozzle pipe once they are cooled to 80°C. The channels are more than 1 mm thick and the pipe has less than 2 mm in diameter. So 3 strings on the cold pull strand doesn’t mean you are having a clogged high flow channel. One is probably ripped off from the cold pull.
Cleaning tip:
The angle of the cleaning needle is important. Insert the needle multiple times and vary with the angle to get inside of every high flow channel.

Have you guys had problems so far with the Prusa High Flow nozzles?
I was thinking if the higher volume in the nozzle could lead to more oozing. But all my tests showed not more oozing or stringing than with normal nextruder nozzles. I guess high flow nozzles are just better! :)
 

Are you familiar with FreeCAD?
You can download nozzle model and get an idea how to do a hierarchical design.

Enjoy inspecting the model and drop a comment with your experience on high flow nozzles.