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Nozzle repeatedly clogging while printing Ninjaflex TPU
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· Nozzle repeatedly clogging while printing Ninjaflex TPU
The filament is probably not clogging but rather it goes all serpentine in the gap between the feeder and the hot end.
Just try printing slower. Does this printer have a long bowden between the feeder and the nozzle? If so add a drop of mineral oil every meter of filament printed. It will not affect the print quality. No one seems to ever believe me but it works well to reduce bowden friction.
So if you are getting 10% extrusion try printing at 1/10th speed. At least go for half current speed.
Regarding pressure - you want low pressure. Grip is not the issue. "pushing a string" is the issue. It's very hard to push a string - it just wants to curl up. In fact I recommend the lowest possible feeder tension as if you squeeze the filament you will get a slower feed rate. Not a disaster but it causes slight underextrusion.
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gr5 1,552
The filament is probably not clogging but rather it goes all serpentine in the gap between the feeder and the hot end.
Just try printing slower. Does this printer have a long bowden between the feeder and the nozzle? If so add a drop of mineral oil every meter of filament printed. It will not affect the print quality. No one seems to ever believe me but it works well to reduce bowden friction.
So if you are getting 10% extrusion try printing at 1/10th speed. At least go for half current speed.
Regarding pressure - you want low pressure. Grip is not the issue. "pushing a string" is the issue. It's very hard to push a string - it just wants to curl up. In fact I recommend the lowest possible feeder tension as if you squeeze the filament you will get a slower feed rate. Not a disaster but it causes slight underextrusion.
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