#Rotation distance/Flow setup help

50 messages · Page 1 of 1 (latest)

stable needle
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I calibrated rotation_distance - or at least thought I did. But it seems like no matter what, I'm ending up with under extrusion. Pics from this calibration were performed with a flow ratio of 1 in orca slicer, 2.3.1-alpha, Polymaker panchroma matte. My other thought was not enough extruder tension, but I cranked it about as tight as it would go for this calibration just as a sanity check.

I used the Ellis guide to calibrate - mark at 120mm, extrude 100mm via G1 E100 F60, compare to 20mm, adjust. This is a WWBMG with smooth idler arm mod (from a4t repo).

I can continue to adjust flow, but I am hesitant to bump this to 1.05+

PXL_20250913_151541081.jpg PXL_20250913_151548339.jpg PXL_20250913_151545147.jpg PXL_20250912_170635766.MP.jpg PXL_20250912_164050441.MP.jpg
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[extruder]
step_pin: t0:PB9
dir_pin: t0:PB8
enable_pin: !t0:PB7
heater_pin: t0:PA7
nozzle_diameter: 0.4
filament_diameter: 1.75
sensor_type: PT1000
sensor_pin: t0:PA6
pullup_resistor: 2200
min_temp: 0
min_extrude_temp: 160
max_temp: 350
control: pid
pid_Kp: 21.777
pid_Ki: 1.357
pid_Kd: 87.377
microsteps: 16
gear_ratio: 50:10
smooth_time: 0.1
rotation_distance: 21.71
max_extrude_cross_section: 6
max_extrude_only_distance: 100
pressure_advance_smooth_time: 0.03
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Let me know if any other info would be helpful, thats all i can think of

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Voron V2.4, built in the last few weeks only print hours are calibration. Stealthchanger but only used or tested T0

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Previously, i had a 50:17 gear ratio set on the extruder due to a misunderstanding of what this value should represent and i had 12.762 rotation distance that I calibrated at that time. I landed at 1.02 flow ratio for this filament with that config.

stable needle
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just to see if there was any value in removing the hotend from the equation, I performed this calibration just on the extruder. These steps cam out a bit low in that scenario (too much extruded) measurement matched on either side of the extruder

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so, not really sure what to make of that. if I up this number I'm going to be even further under extruded.

I may try going back to Orca 2.3.0 for the more traditional chip flow calibration without the archimedean chords

stable needle
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changed the rotation distance to match the latest calibration, 22.36 and it seems to confirm this is still off with the standard orca 2.3.0 test.

so at this point I guess I'm just gonna go above 1 for flow ratio and that's the way this printer works?

PXL_20250913_191443482.jpg
sinful smelt
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Have you looked at Ellis flow calibration? He uses 9 to 11 layers on the top and a few layers of infill to avoid propagating issues from the bed into the flow calibration. I also don't see any harm in going above 1.05 if that's what your printer needs.

stable needle
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final rotation distance, which I extruded 3 times in a row to check, was 21.91

opaque aurora
stable needle
opaque aurora
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Someone else may be able to explain it clearer

stable needle
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right. so I did that, following the Ellis guide and the rotation distance that seemed to end up at was 21.91 but it doesn't line up with 1 for flow at all, not even close

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I'm used to 1-2% for a given filament or mfg but 10% off seemed like something is not right

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in the first round of pictures I start at 120 and compare to 20, which I believe is what you are saying

opaque aurora
stable needle
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that will make it easier to recalculate, thanks. I will check again but at this point it seems to be spot on when asking for 100mm I get 100mm +/- <.0.5mm but the flow number just doesn't seem to make any sense

opaque aurora
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@stable needle , did I see you were using Orca?

stable needle
opaque aurora
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So if you are happy with the rotation values, I usually use the YOLO Reccom first

image.png
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Then depending if I find the best one within the swatches ie. not the first or last, I sometimes do the perfectionist YOLO, but mostly find what I need in the first one

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Although, I set it to two bottom layers, 2 infil and 6 top layers..

stable needle
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first round was testing out the older flow test. set it to 1.05 based kn that. then went back to the new one using 1.05 as the starting point

opaque aurora
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It's always difficult to see on a screen, but from what I can see and a few are slightly out of focus when you zoom in, 0.97 looks good ie -.03. To me at least

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I look for the smoothest one, where your finger nail slides across the lines smoothly, if they feel like ridges - they are... smooth as for me.

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Again there are far better spotters on here..

stable needle
opaque aurora
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And last circular one

stable needle
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so the circles are taken from a 1.05 flow starting point

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for the first one, you would choose -0.03?

limber rampart
stable needle
limber rampart
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This is black I don’t have a orange

IMG_3709.jpg
stable needle
limber rampart
robust apex
stable needle
# robust apex its been 16 days. Any update for us? Do u need further help?

Thanks for checking in - interestingly things have been somewhat all over the place:

  • Ambrosia PLA ended up with a flow ratio of 1.025
  • LDO ABS ended up at .975 ish still tweaking that one slightly

so, i have to think there's something about that matte PLA that was weird.

One thing I have noticed is that the "smooth idler mod" has had some trouble with softer filaments, jsut grinds a hole in them. So i am working on printing arms to use 2x BMG gears instead of a BMG gear + smooth bearing. This could also be contributing perhaps to extrusion weirdness if its slipping or smooshing too much I would assume

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I don't think I need help at this point - we could close this up. Just following up