Good afternoon. I have just gone through the mod process, not saying what I did was right, but I have heard from a filament maker that it will work and prevent damaging wear on my UM3.
The stock AA printcores cannot tolerate abrasive filaments for very long. The first thing needed is to acquire a hardened printcore. The second is a hardened feeder.
I went with a 3dSolex Hardcore printcore AND everlast nozzles with ruby or sapphire. I tend to use a 0.6 size as it seems less likely to clog, but I bought a wider range as it made sense with shipping. Ultimaker has just