PTFE Teflon tubing 10ft - 3mm ID X 4mm OD for 1.75 Filament Bowden 3D Printer - Allen Tech PTFE Teflon Tube

Rather then getting this tubing since it's expensive, I was told about this. It's still normal PTFE tubing, but the inner diameter is 3mm instead of your normal 2mm, which means the filament going through the tubing has almost no friction and it still works just fine. I use it for my CFS and TPU from the dryer, to have 0 friction issues, so I don't have to direct load the TPU. Give it a try!