TPU at Nozzle
When I try to load to nozzle the TPU begins to come out of the nozzle but just keeps extruding like it is running until it feels resistance(?). I am not sure. I have printed hundreds of prints in PLA and even MMU changes. I can not get TPU to load. It makes it to the nozzle and then just keeps extruding until it times out then tries to unload TPU. This is all being done from the screen. I even tried to control axis and load nozzle from extruder control then start file print but it levels then tries to load TPU even though it is already all the way to the nozzle. My IR is working properly it just wont stop extruding after getting to the nozzle. I dont know what makes it stop and then begin printing.
RE: TPU at Nozzle
It should be the IR sensor. You might need to reduce the extruder tension. If it is set to high the TPU will be compressed and the IR doesn't react.