#reallymadrob The index wheel detects only if filament is moving. It is a simple contact wheel with an optical sensor. If the indication on the index wheel does not change value in the right time after an extrusion command is given, the software flags the "Filament not moving as expected" error and starts attempting to solve the issue.
The filament exit sensor is a switch with a sensor flap. If the filament pushes the sensor flap in far enough to close the switch, the printer knows filament is loaded. If the switch stays open, the printer assumes no filament is loaded.
By using these signals in combination, the software determines if filament is loaded or not, where the end of the filament is relative to the extruder exit switch, and if the filament has run out.
I would not recalibrate the head for different brands of PLA; they should all be relatively the same viscosity. If you are seeing stringing, I would look for material buildup on the head or I would assume your filament is wet.
Posted : 12th December 2015 6:54 pm