Underextrusion only after corners

PCR

Increase the flow;)
Dont measure the Esteps with a single wall

p8blr

@pcr How do you like to measure the esteps? I get similar numbers using two walls.

PCR

@p8blr i do it with the 100mm extrusion length. Then I look that my top layer is closed. Your top layer still have gaps

Phaedrux

Indeed. Looks like a bit of underextrusion in general. Calibrate your extruder.

https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165

p8blr

I used calipers to measure out 100mm of filament and adjusted my esteps accordingly. My top layer does not have those gaps like before, and maybe it's even a little overfilled. However, the cube I printed measures accurately to the 3D model, only being +.02mm too big in X, Y, & Z.

Unfortunately, as you can see below I am still experiencing the gaps in the corners. Any other ideas?

test 2.jpg

Phaedrux

@p8blr said in Underextrusion only after corners:

M572 D0 S0.1

0.1 is actually quite a lot of pressure advance for a direct drive. For instance, my best results with a Titan Aero is 0.025.

Have you gone through a tuning process to identify your correct PA value yet?

https://duet3d.dozuki.com/Wiki/Pressure_advance

As for the slight over extrusion now, yes that could be the case. I'm not a S3D user, but there should be a place to specify the actual filament diameter as measured and to tweak the flow rate slightly. It's not uncommon to use ~95% slicer flow rate to get clean looking prints.

engikeneer

@p8blr might also be worth checking your infill overlap percentage in the slicer (note that you may need to adjust this when you change pressure advance)

p8blr

@phaedrux I have yes, but I ran another test:

{REPLACE "; layer 5"   "M572 D0 S0.01\n; layer 5"  }
{REPLACE "; layer 10"  "M572 D0 S0.02\n; layer 10" }
{REPLACE "; layer 15"  "M572 D0 S0.03\n; layer 15" }
{REPLACE "; layer 20"  "M572 D0 S0.04\n; layer 20" }
{REPLACE "; layer 25"  "M572 D0 S0.05\n; layer 25" }
{REPLACE "; layer 30"  "M572 D0 S0.06\n; layer 30" }
{REPLACE "; layer 35"  "M572 D0 S0.07\n; layer 35" }
{REPLACE "; layer 40"  "M572 D0 S0.08\n; layer 40" }
{REPLACE "; layer 45"  "M572 D0 S0.09\n; layer 45" }
{REPLACE "; layer 50"  "M572 D0 S0.10\n; layer 50" }
{REPLACE "; layer 55"  "M572 D0 S0.11\n; layer 55" }
{REPLACE "; layer 60"  "M572 D0 S0.12\n; layer 60" }
{REPLACE "; layer 65"  "M572 D0 S0.13\n; layer 65" }
{REPLACE "; layer 70"  "M572 D0 S0.14\n; layer 70" }
{REPLACE "; layer 75"  "M572 D0 S0.15\n; layer 75" }
{REPLACE "; layer 80"  "M572 D0 S0.16\n; layer 80" }
{REPLACE "; layer 85"  "M572 D0 S0.17\n; layer 85" }
{REPLACE "; layer 90"  "M572 D0 S0.18\n; layer 90" }
{REPLACE "; layer 95"  "M572 D0 S0.19\n; layer 95" }
{REPLACE "; layer 100" "M572 D0 S0.20\n; layer 100"}

test 3.jpg

It seems like the start/stop gap begins right around .1 so that's where I've left it. Although, I've never really been able to get a nice looking start/stop. I've played with extra restart distance and coasting distance and the don't make much of a difference in my testing.

Yes I should have measured my filament first, I'll do another test with that added in Simplify3D to see if the over extrusion goes away.

Phaedrux

0.1 may still be quite a lot for a direct drive, I'd suggest doing another test with values ranging closer around 0.1. Perhaps start with 0.01 up to 0.1.

What range of values did you use in the test?

p8blr

@phaedrux .01 to .2 in .01 increments.