Sankets Journal

Ender3 S1 PRO Retraction Test Findings

Author: Sanket Sonavane

Publish Date: 2023-03-11

Last Updated: 2023-03-12

Table Of Content

NOTE:
This is a live article i.e. as and when new information is observed or found it will be

  1. appended with time stamps to the end
  2. corrected in place, if earlier documentation was incorrect

what I am using

  • Ender 3 S1 Pro on stock marlin firmware
  • Cura 522 as slicer of choice

quick summary

after a lot of tests and trying to find the best value so far I have found that for Ender 3 S1 PRO with esun PLA+ filament produced best results

  • retraction distance 0.8mm
  • retraction speed 40 or 50 mm/s
  • fan speed 100%

I have not been able to better the fine threads much despite all tests 0.7 and 0.8mm are sweet spots.

common settings for all retraction tests

  • 0.3 Layer height was used for all
  • 3 wall perimeter
  • infill density 20
  • infill pattern cubic
  • initial temp 205nozzle 70bed
  • temperatures 205 nozzle 60bed

approaches to try

these are summary of suggestions which I have received from various communities on discord and reddit

  •   retraction speed 25mm/s
  • retraction speed 50mm/s
  • retraction distance 1.0mm
  • retraction distance 1.5mm and retraction speed 30mm/s
  • check Retraction Calibration Tool
  • slowing down fan speed
  • check combing options
  • adding wipe distance
  • check out teaching tech's calibration page
    • teaching tech retraction test

test results

test date: 2023-03-11 findings

  • TEST 1: retraction distance 0.8mm and retraction speed 40mm/s
    • result: same to one shown in screenshot
  • TEST 2: retraction distance 1.5mm and retraction speed 30mm/s
    • result more stringing might be because of 1.5 so decided to go back to 0.8
  • TEST 3: retraction distance 0.8mm and retraction speed 50mm/s
    • result : might be a bit less string compared to test 1
  • TEST 4: retraction distance 0.8mm and retraction speed 25mm/s
    • result: same as 1 with fine stringing

test date: 2023-03-11 findings

  • increasing the retraction distance from 0.8 to 1.0 to 1.5mm I observed more stringing hence reverted back to 0.8 and will keep that constant as I tried various retraction speeds.
  • with retraction distance set as 0.8mm I tested retraction speeds of 25mm/s,40mm/s,50mm/s and while the stringing was looking similar it seems like higher speeds helps so I might continue further test with 50mm/s
  • so far option 3 looks best to me i.e. retraction speed of 50mm/s
  • there are a few more suggestions that I need to look into like
    • fan speeds
    • combing modes
    • wipe distance options

safe retraction speeds

according to wevolver.com article retraction speeds of 30~50mm/s are safe for Ender3 and I have tried to remain in these levels while performing my tests

Quoting a few points from the same article

Note that some slicers (e.g. Cura) will allow you to set different speeds for retraction (pulling the filament back) and priming (returning the filament to its original position). However, if these fields are left blank, then the overall retraction speed will apply in both situations.

Recommended Ender 3 retraction speed: 50 mm/s, decreasing in increments of 5 mm/s if filament grinding occurs

retraction calibration tool

test date: 2023-03-12 findings

Retraction Calibration Tool this is an interesting test to help narrow down the retraction settings.

This is how I set the two tests up

attempt 1

test date: 2023-03-12 findings

top
top

top-2
top-2

front
front

right
right

back
back

left
left

front-right
front-right

front-left
front-left

back-right
back-right

back-left
back-left

observations

  • anything above retraction distance of 2.25mm was producing stringing so skip those for next tests
  • as the tower height increases more of the fine threads are observed
  • walls have less gap from retraction distance 1.0mm onwards
  • as layer height increases the fine threads start increasing so to test this hypothesis I need to increase number of layers for each retraction speed from 25 to 50 layers and see if this behaviour is observed

attempt 2

test date: 2023-03-12 findings

top
top

front
front

right
right

back
back

left
left

front-threads
○front-threads

right-threads
○right-threads

back-threads
○back-threads

left-threads
○left-threads

front-right
front-right

back-left
back-left

observations

  • for back side, ignore retraction distance 1.3 to 1.6 as fine threads observed on the outside as well on inside.
  • for left side, ignore retraction distance 1.7 to 2.0mm, while there are less of the fine threads but they are still there.
  • as the tower height increases more of the fine threads are observed
    • so for all sides with retraction speed for 10mm/s there is less of those fine threads.
    • these threads are visible on affected sides as we start going upwards in retraction speed 20, 30, 40, 50mm/s tests
  • after inspecting all sides and individual walls settled for retraction distance 0.9mm and retraction speed 40mm the 0.8mm is also good but 0.9mm looks better.
  • however actual test prints with 0.9 were not that good so reverted to 0.8mm

normal retraction tower test

to test all the results of the above test here is the output of

  • retraction distance 0.8mm retraction speed 40mm/s fan speed 100% and this looks good.
  • retraction distance 0.7mm retraction speed 40mm/s fan speed 100% and this looks good as well.

fan speed tests

test date: 2023-03-12 findings

attempt 1

retraction distance at 0.7mm and speeds at 40mm/s for this test

  • testing at 50% ❌
    • result: had far more fine threads than fan running at 100%
  • testing at 70%
    • skipped as running the fan at slower speeds was producing more threads

references

reddit

retraction calibration tool

articles

teaching tech articles and videos