RRC
Rat Rig Community [Unofficial]•4w ago
za_naimis

mushrooming filament, unload variables have no effect

Since replacing the Eva 3 with a RR Toolhead and adding a Orbiter sensor, I find that when unloading filament, it mushrooms and gets stuck just above the extruder gears, as indicated in the image. If I push the filament back in by hand, enough to reheat it and purge a bit, and then pull it back out fairly quickly, I can remove the filament. So I thought I'd try setting the variable that's supposed to effect unload speed, but it didn't. I tried moving it up to 10 mm/s, then 30, then 100, but there was no change between any of those. I know it's capable of running at least 25mm/s in reverse as the retract option in klipperscreen will actually run faster when selecting that speed. printer.cfg excerpt: 
#############################################################################################################
### MACRO CONFIGURATION
### Configure the behavior of RatOS macros
### See: https://os.ratrig.com/docs/configuration/macros
#############################################################################################################
[gcode_macro RatOS]
variable_relative_extrusion: False
variable_preheat_extruder: True
variable_calibrate_bed_mesh: True
variable_nozzle_priming: "primeblob"
variable_start_print_park_in: "back"
variable_start_print_park_z_height: 50
variable_end_print_park_in: "back"
variable_pause_print_park_in: "back"
variable_filament_unload_speed: 100
#############################################################################################################
### MACRO CONFIGURATION
### Configure the behavior of RatOS macros
### See: https://os.ratrig.com/docs/configuration/macros
#############################################################################################################
[gcode_macro RatOS]
variable_relative_extrusion: False
variable_preheat_extruder: True
variable_calibrate_bed_mesh: True
variable_nozzle_priming: "primeblob"
variable_start_print_park_in: "back"
variable_start_print_park_z_height: 50
variable_end_print_park_in: "back"
variable_pause_print_park_in: "back"
variable_filament_unload_speed: 100
No description
3 Replies
blacksmithforlife
blacksmithforlife•4w ago
Debug.zip please
za_naimis
za_naimisOP•4w ago
before anyone jumps on me for having a "rome_lite" and "rome", I only just installed the latter a few minutes ago and it has no bearing on this particular issue.

ratos-debug.zip

za_naimis
za_naimisOP•3w ago
welll...... obviously can't fit a camera in there to see what's going on, but I've switch tip forming mode back on, and will probably experiment with that for a bit, but I'm currently wondering if the reason for the mushrooming isn't from pushing the filament against the nozzle as I previously suspected but rather is from the gears pushing the filament up at its limit. I guess the way to test this hypothesis would be to change the unload process so that it doesn't fully disengage the filament from the gears and try pulling it out by hand the rest of the way when it's done. Kind of curious, though, that the upper part is catching the filament but not the lower part, implying that the lower part has a larger hole for the filament than the upper. Tempting to drill out the upper part a tiny bit, but being a destructive action, I want to keep that as a later option. disabling the final step in the new unload macros (_UNLOAD_FILAMENT_FROM_COOLING_ZONE_TO_EXTRUDER) by overriding, it still mushrooms a bit but not so much that I can't pull it out with only a little resistance. I'll have to try again with it reenabled for comparison. the plan to check the size of the holes, non-destructively, is set aside as well. I don't want to have to take apart the toolhead again. Used the newer unload macro for a bit. It seemed better, to begin with, but when I went to unload my "white AF" PLA filament, it blobbed up again, worse than previous times. I had to pull the filament out from the middle of the extruder and cut off the end before I could pull it the rest of the way out given the conversation in multi-material, it might just be because I did the unload at the default temp of 220 (this filament prints well at <200)

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