Buffer not doing anything | ArmoredTurtle 3D | Page 1

heavy agate Jul 1, 2025, 3:12 PM

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Hi guys! I have the buffer set up, but it seems like the BT is doing retractions in-step with the extruder, causing lots of stringing. The buffer is ALWAYS fully extended, and I have Turtle_1: Advancing on my dashboard. How can I fix?

Here's my config:

enable_force_move: True

[AFC_extruder extruder]
buffer: TN
pin_tool_start: MKS_THR:gpio25
pin_tool_end: MKS_THR:gpio24
tool_stn: 29                    # Distance from the toolhead sensor to the tip of the nozzle in mm.
tool_stn_unload: 62            # Unload distance for the toolhead in mm.
tool_sensor_after_extruder: 0   # Distance in mm.
tool_unload_speed: 25           # Unload speed in mm/s. Default is 25mm/s.
tool_load_speed: 25             # Load speed in mm/s. Default is 25mm/s.

#[filament_switch_sensor bypass]
#switch_pin: turtleneck:PB5
#pause_on_runout: False


[AFC_buffer Turtle_1]
advance_pin: ^Turtle_1:TN_ADV    # set advance pin
trailing_pin: ^Turtle_1:TN_TRL  # set trailing pin
multiplier_high: 1.05   # default 1.05, factor to feed more filament
multiplier_low:  0.95   # default 0.95, factor to feed less filament

waxen sparrowBOT Jul 1, 2025, 3:13 PM

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<@&1304550334839918672>

turbid sun Jul 1, 2025, 3:13 PM

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heavy agate Hi guys! I have the buffer set up, but it seems like the BT is doing retractions...

First verify that the TN is working as intended based off this guide https://www.armoredturtle.xyz/docs/boxturtle/initial_startup/05-additional-tests.html#turtleneck-buffer

heavy agate Jul 1, 2025, 3:15 PM

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it is, however, it says "Advancing (Compressed) - and in your guide, it says that Advancing should be extended, so I switched the connectors. Not sure which is correct

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Turtle_1 : Advancing (Compressed)
lane1 Rotation distance: 4.4286

lofty kite Jul 1, 2025, 3:16 PM

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The language is a little confusing. If you have the sensors visible in mainsail, they're labeled compressed and extended.

turbid sun Jul 1, 2025, 3:16 PM

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advancing should be when its not expanded as its what AFC is doing(advancing the filament more than your toolhead extruder)

heavy agate Jul 1, 2025, 3:18 PM

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ok, then the guide is wrong in numerous places, FYI.

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i'll swap the connectors again, and then we can diagnose

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k we good

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however, somehow, i don't think the BT is supposed to be doing retractions 🤣

midnight gyro Jul 1, 2025, 3:21 PM

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It does, if the main extruder does a retract it will also do a retract.

ionic remnant Jul 1, 2025, 3:21 PM

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Whatever the main extruder is told to do, the turtle will also do

heavy agate Jul 1, 2025, 3:21 PM

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oh, bizarre....

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however, shouldn't it be allowing the buffer to compress? It's always pushed out

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....is it just very happy to see me?

midnight gyro Jul 1, 2025, 3:22 PM

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Check and make sure it didnt pull the PTFE in too far and is jamming it out.

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Ideally, it should kinda hang out in the middle during normal printing

ionic remnant Jul 1, 2025, 3:22 PM

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Always very happy to see you 👀

In all seriousness, the buffer should move, but during most swaps/short moves it may not move

heavy agate Jul 1, 2025, 3:23 PM

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heh, likewise, how ya been Belial: )

turbid sun Jul 1, 2025, 3:23 PM

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heavy agate ok, then the guide is wrong in numerous places, FYI.

Can you hit the orange turtle on the pages that are wrong and it will create an issue for them, and we can look into fixing them

heavy agate Jul 1, 2025, 3:23 PM

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the spool is rapidly spinning once in a while now, so that's new, at least

ionic remnant Jul 1, 2025, 3:24 PM

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heavy agate heh, likewise, how ya been Belial: )

Life’s been hectic, yourself? Hope you’re staying safe with everything going on

midnight gyro Jul 1, 2025, 3:24 PM

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Yeah thats the fwd assist, so the buffer is being triggered.

turbid sun Jul 1, 2025, 3:24 PM

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heavy agate the spool is rapidly spinning once in a while now, so that's new, at least

^^ https://www.armoredturtle.xyz/docs/afc-klipper-add-on/features.html#espooler-print-assist

heavy agate Jul 1, 2025, 3:24 PM

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done 🙂

heavy agate Jul 1, 2025, 3:25 PM

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ionic remnant Life’s been hectic, yourself? Hope you’re staying safe with everything going on

All good. The hardest part was the kids being home, but, easy for me to say, we have a bomb shelter in the apartment. A lot of people had to sleep in train stations and stuff 😦

heavy agate Jul 1, 2025, 3:25 PM

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midnight gyro Yeah thats the fwd assist, so the buffer is being triggered.

OK, so, I guess we are all good, but maybe I need to make it more aggressive? I have a lot of printers with a lot of buffers, and I've never seen it so consistently extended.

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the stringing is noticeably better all of a sudden.

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should i maybe increase the factor...?

midnight gyro Jul 1, 2025, 3:29 PM

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midnight gyro Check and make sure it didnt pull the PTFE in too far and is jamming it out.

Did you check this?

heavy agate Jul 1, 2025, 3:37 PM

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lemme check. just had a weird issue where none of the filament runout sensors worked. It's always something with this machine 🙄

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good call! we have motion

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am i supposed to have these commented out...?

midnight gyro Jul 1, 2025, 3:44 PM

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If the toolhead switch is defined in the AFC config yeah, klipper will get bent about multiple definitions.

heavy agate Jul 2, 2025, 6:52 AM

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odd, overnight, filament clogged (recycled filament) and the printer didn't detect. What do I need to check to fix that?

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it's not detecting runouts OR clogs, which seems odd to me

leaden widget Jul 2, 2025, 10:03 AM

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Nothing in AFC will detect a clog. That needs something like sfs to detect the motion and that needs modified macros to not cause a pause

hazy lantern Jul 2, 2025, 9:28 PM

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it's on the list of things. to try to add it will detect runout at hte prep switch but not clogs or other jams.

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if the filament gets jammed at hte prep switch, or if the prep switch doesnt' return back to a 'closed' position when filament passes it, then the runout won't trigger also.

#Buffer not doing anything