TPU and filament sensor
So started doing some tpu testing this evening. and I had to bypass the filament sensor. it was putting an incredible amount of drag on the filament. So much so it was causing underextrusion.
I have a ninjaflex + sainsmart test print going, and running both around the filament sensor has done the trick. I looked at the filament sensor and I have adjusted so that the ball bearings in there only fill half the hole, instead of 80%.
So if you're trying to print tpu and you're noticing that tpu is really hard to push through the filament sensor, before it even gets to the extruder, this is probably your problem too.
RE: TPU and filament sensor
I'm also reducing the stock profile temps by 1 deg to eliminate some whisping
RE: TPU and filament sensor
This is currently what I have to do to get tpu to print correctly. that filament runout sensor creates FAR too much drag on the filament.
This is in addition to have to help get the filament loaded into the extruder by removing the connector and pushing the filament in through the extruder's filament sensor. This is why having the extruders come to the front of the bed when loading would be handy instead of at the back.
RE: TPU and filament sensor
latest alpha firmware does indeed bring the extruder to front of bed for filament changes, that's an improvement.