I have had this R2 for a short time and there has been no issues with any PLA filaments that I have been using here. However, when getting to the flexible ones, nothing but trouble. I have/had a roll of TPU and TPE and constantly like clockwork, a whole bunch just coils up behind the feed gear. From what I can tell it keeps slipping out of place even when feed through properly. Nothing else has given trouble at all but these. I have been lucky enough to pull it and get it to retract out, other times I have had to cut the TPE out and hope not damage that gear. What is causing this? I mean for a time it does extrude through and suddenly jams. No clicking, just a big mess of TPE balled up behind the gear.