#String prevention + purge block + filament doesn't reach toolhead sensor (just barely!)

1 messages · Page 1 of 1 (latest)

sleek hound
#

Hello!

I am tuning my machine for my BT, which is mostly working wonderfully. A couple hiccups here and there but I think my extruders were undertensioned (well, too far anti-squish screw).

  1. I'm looking to reduce stringing while pooping
  2. I'm looking to clean my purge block so it's less lumpy OR just not use a purge block entirely. Currently when the toolhead resumes after a poop, it deposits a little too much filament onto the block at it's start position. it hasn't caused much issue but it definitely isn't as clean as my bambu purge blocks.
  3. Should I increase my afc_bowden_length to account for the filament barely not reaching my toolhead sensor? 90% of the time it scoots 1 or 2 times and gets into the toolhead, but one swap on lane4 just barely didn't make it.

Pic attached is the filament barely making it to the toolhead but not getting to the sensor (this was like 50 swaps deep into a print).
Video - https://streamable.com/vavnyv - showing it working, but you can see the striging and the bad purge block

<@&1304550334839918672> much love, hope to serial soon <3

image.png
Streamable
Watch unnamed | Streamable

Watch "unnamed" on Streamable.

acoustic matrix
#

what was that THUMP at the end?

#

at 45

sleek hound
#

toolhead sensor

#

ball bearing pushes it and actuates it

acoustic matrix
#

it seems to think its triggerd but dosent engage the extruder

sleek hound
#

so the video is it completely working

#

no issues

#

the picture is right afterfailure

#

you can see the switch wasn't triggered

#

I got one of those LEG4 COULD NOT BE LOADED messages

#

can't remember the exact wordage

sly wolf
#
  1. More filament tuning in general
  2. Some of this is a little clunky in orcaslicer and they are working on it
  3. Yes, increase your bowden length.
acoustic matrix
#

with that angle i whould asume it hit the inside of the print where the tube enters

sleek hound
#

should it usually hit the sensor without having to scoot?

#

or just shy of the sensor

acoustic matrix
near vault
#

1-2 short moves of the sensor

sleek hound
#

gotcha

sly wolf
#

In a perfect world the long move should stop just shy of it and the following short move should trigger it

sleek hound
#

that's what happens 99% of the time

#

but i came back to the blue one failed like that

#

I think/thought it was caused by the lane4 extruder not gripping the filament and moving it as far as it should have gone?

#

I could push the anti squish screw a little further in if it's a possibility

near vault
#

Possible

acoustic matrix
sly wolf
#

If you had a stall or anything it can create a thin spot in the filament and cause it to not travel the full distance or stall completely.

sleek hound
near vault
#

Just wanna say, when tuned correctly, the BT will extrude enough to print parts without your tool head extruder KEK

sleek hound
sly wolf
#

Its a really good bowden extruder

near vault
#

It's also very stronk

sleek hound
#

for reference, the bite marks on leg4

sly wolf
#

You can probably back that off some.

sleek hound
#

not too shabby, so i don't imagine i need more force?

acoustic matrix
sleek hound
sly wolf
#

Im still on old extruders, I dont even have anti-squish lol

sleek hound
#

maybe i can torture test it rq by just swapping between leg4 and leg3 repeatedly

#

like one layer at a time

acoustic matrix
#

you can just load and unlode the toolhead without printing as well

sly wolf
#

Is it only leg 4 that is seeing the loading discrepancy?

sleek hound
#

previously I saw it on leg3 as well, but leg3 was undertensioned

#

antisquish was too far out

#

so i pulled antisquish on leg3 and 4 in a bit for more grip

sly wolf
#

When it fails, is it the first time the lane has loaded?

sleek hound
#

def not

#

I was like 50 swaps in

sly wolf
#

Ok.

sleek hound
#

plenty of swaps on that lane

#

I just recalibrated my afc bowden length using the built in methods and it increased by 20mm

sly wolf
#

If its the first time sometimes the hub_dist can be off and cause issues.

sleek hound
#

i recalibrated using that same lane

#

what is hub dist?

acoustic matrix
sleek hound
#

like, per lane hub dist?

acoustic matrix
#

ye

sly wolf
#

Yeah

sleek hound
#

ok yeah i have that already configged

sly wolf
#

But if its not the first load, it should be parked at the hub already so thats not as pertinent.

sleek hound
#

yeah

#

after adding tension, it always reaches the hub

#

no issues there

sly wolf
#

Thats what "loaded to hub" means on the AFC Query.

#

What buffer are you using?

#

TN?

sleek hound
#

TN1

sly wolf
#

Did you run the automated calibration?

sleek hound
#

there is one for TN?

sly wolf
#

No for the bowden length.

sleek hound
#

I ran just the one for the BT itself

sly wolf
#

OK, did you happen to notice if your TN expanded during the test?

sleek hound
# 

No lanes selected to calibrate dist_hubAFC Calibration distances +/-5mm
Update values in AFC_Hardware.cfg
afc_bowden_length: 1430.0
3:05 PM
Calibrating Bowden Length with LEG4
3:05 PM
Starting AFC distance Calibrations
3:05 PM
AFC Calibration distances +/-5mm
Update values in AFC_Hardware.cfg
LEG1 dist_hub: 170.0
LEG2 dist_hub: 90.0
LEG3 dist_hub: 95.0
LEG4 dist_hub: 170.0
#

oh I wasn't payin gattention

#

I should keep it compressed during that shouldn't I

acoustic matrix
#

i manualy held mine in the midle during the calibration

sly wolf
#

So if it did not expand, when youre getting the lane 4 coming up short, it could be because the TN is expanded

#

Its ~ 30mm difference between expanded and normal

sleek hound
acoustic matrix
sly wolf
acoustic matrix
#

i had my tn2 explode once due to the force of a to long bowden tube in the config

sleek hound
sly wolf
#

Since youre taking 2 short moves to hit your toolhead sensor you could try bumping your bowden length by like 15 or 20 just to get a bit of extra distance.

sleek hound
#

the auto calibrate came up with a 20mm longer distance already

#

so i'll give a little torture test a shot

sly wolf
#

This is kinda stuff you just have to play with and find what works for your setup

sleek hound
#

yee

#

makes sense

sly wolf
#

To revisit question 2 for a second, do you have "Puge in prime tower" enabled in orca under your machine settings?

sleek hound
#

yes

#

well

#

gimme a sec

sly wolf
#

You can disable that since you're running poop

acoustic matrix
sleek hound
#

just did, thanks

#

much much much smaller purge block now

acoustic matrix
#

last time i had a look it did not

sly wolf
#

it will reduce the size of the purge block and allow you to control it a bit more, I find I usually get a blob at the seam on the purge and it smooths out after that. When orca is having it purge it does things with extra flow and whatnot

sly wolf
#

I believe its still whatever you configure it to purge.

#

I get good color separation with stock poop params and like a 20mm prime tower.

acoustic matrix
#

but then you cant disable purge into prime tower? it wont prime the right amount? it will always just prime a set amount regardless of color? just use the multiplier in the flushing volums to get somthing better.

sly wolf
#

You absoluitely can.

#

As its literally what I am doing.

sleek hound
#

prime block is like 1/8th the size

#

i was already 100% purged by the time i got to it anyway

sly wolf
sleek hound
#

only used it for print quality reasons

sly wolf
#

If not its not correct anyway.

acoustic matrix
sly wolf
acoustic matrix
#

its mostly holow tho

sly wolf
#

Poop will clear just about anything that doesnt have an absoluitely massive melt zone.

#

Stock poop settings are more than sufficient for Revo.

sleek hound
#

my dragon UUHF setup needs some PUUURRGING

acoustic matrix
#

it just wastes more material, thats it

sly wolf
#

Does it?

#

lol

acoustic matrix
#

yes. it then purges the same amount going from white to red as red to white. those reqier hugly different amounts of purging to not get red colour bleed in the white

sly wolf
#

I'm on a revo though,

acoustic matrix
sly wolf
#

Im mostly just purging my cut length

acoustic matrix
#

revo hf 0.4 brass 40W is what i am running

sly wolf
#

Same.

#

Its ~ 72mm per poop.

#

There are settings for variable purge but I have not played with them myself

#

I know someone has gotten blobifier working with AFC

acoustic matrix
sly wolf
#

I mean in AFC poop.

acoustic matrix
#

will that be pushed to main in the near future?

sly wolf
#

Its in main.

#

I think part of the issue at the moment is how orca passes the purge volumes. Like I said, I saw some discussion on that with one of the folks from the Orca team

acoustic matrix
#

@sleek hound how is things going? any issues so far?

sleek hound
#

only a couple changes in but so far so good

acoustic matrix
#

nice!

sleek hound
#

new bowden length puts it literally 1 push away from getting into the toolhead

#

which is great

sly wolf
sleek hound
#

sorry, the toolhead sensor***

sleek hound
#

test print went perfect

#

serial print underway

acoustic matrix
sleek hound