This might seem odd but have had great results depending on model will occasionally get string but easy enough to flush cut or razor blade clean,
Machine- Cr10s pro
Hotend- microswiss all metal hotend
Filament- ninjatek cheetah TPU
Nozzle- .4mm
Extrusion multiplier- 1
Extrusion width- .4mm
Retraction- off
Coast- .10mm
Bed temp- 52 deg C
Nozzle temp - 252deg C
Cooling- layer 1 off, layer 2 70%
Default print speed- 60mm/s
First layer speed- 50%
Outline underspeed- 60%
Solid infill underspeed- 75%
Have been printing mask after mask with those settings and haven't had one fail thus far the lower layers come out clean and on point for dimensions on the mask model specifically stringing does occur on the upper layers of the model but nothing that not manageable other models same setting have produced a clean finish no stringing