Hi all,
I've updated the title and original post to clarify that this only seems to happen when running dual colour prints. Single colour prints with the same filaments seem to be working fine. I have an update on the situation. I'm still having the same issues, but I noticed that when I remove the material from the printer following a failure the end which was in the hot-end is larger in diameter, up at 3.4mm from 2.85 as shown below. Could it be that the nozzle isn't getting back up to temperature quickly enough, causing a temporary clog until the filament is heated enough to pass through the extruder, then the backpressure on the filament is causing the filament to tear and then eventually strip? This would explain why I don't have to clean the nozzle out after failures, as the "clog" fixes itself when the nozzle hits temperature, but it creates just enough backpressure to cause the problem? Would this make sense or am I talking from my armpit?