Have problems with my titan aero jamming on high retraction prints. it stops on the part of the print which are the fine detail part where it spend most of the time in retraction. I can cut down the odds by setting the retraction to 1mm or less which causes stringing. ( tried adjusting the tension from too loose to too tight + Temp 190 to 220c) When I pull out the filament there is a ball on the end, which is why it stopped going into the hotend. Being a homemade cr10s 4.5 s printer before I put it down to a Z problem , but after a second rebuild I know my printer will print like glass and the BLtouch say it`s repeatable down to .002 error.