This is the OmniaDrop extruder. It was specifically designed to print every filament reliably, which includes some of the most difficult to print flexible filaments. Check out the features of this extruder:
https://www.dropeffect.com
Model by Teak https://www.thingiverse.com/thing:168...
These are the print speeds for each filament
3mm FilaFlex Ultra-Soft
30 mm/s default print speed
3 perimeters/shell
Outer perimeter @ 75% of printing speed
Retraction 4 mm @ 60 mm/s
No infill
5 bottom layers
3mm Ninjaflex
40 mm/s default print speed
3 perimeters/shell
Outer perimeter @ 75% of printing speed
Retraction 4 mm @ 60 mm/s
No infill
5 bottom layers
1.75 mm Ninjaflex
40 mm/s default print speed
3 perimeters/shell
Outer perimeter @ 75% of printing speed
Retraction 2.5 mm @ 40 mm/s
No infill
5 bottom layers
1.75 mm Diabase X60 Filament
25 mm/s default print speed
3 perimeters/shell
Outer perimeter @ 75% of printing speed
Retraction 2.5 mm @ 30 mm/s
No infill
5 bottom layers