📑Report: LA1.5 fix

[3d-gussner]

Please report here your LA1.5 fix test results.

UPDATE 30 Juli 2020

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A new LA @wavexx version to improve LA1.5. It is based on https://github.com/wavexx/Prusa-Firmware/tree/la15_acc_fixes Please also try Report: Retraction test results to see that the BETA didn't break anything there.

UPDATE 22 June 2020

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After the feedback on FW391-BETA-3459 @wavexx implemented another fix. It is based on https://github.com/wavexx/Prusa-Firmware/tree/la15_acc_fixes Please also try Report: Retraction test results to see that the BETA didn't break anything there.

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• [G] Check for gaps at seam and other places 0=big gaps 10=perfect seam
• [V] Check for vertical lines, good to see at arcs 0=very 10=not visible
• [A] Check for overall best result 0=bad 10=best

Use the 3mf and gocde files in zip below. Speedtest_simple_25mm_every_5mm_different_speeds.zip

Or with also with temperature changes: starting at 215°C and increasing by 1°C. You may need to change the new temps depending on your filament brand. The idea behind this is to get the same "glossiness" at different speeds, as normally with increase speeds the material "glossiness" changes. Speedtest_simple_25mm_every_5mm_different_speeds_and temps.zip

Every 5mm the speed changes

• Printer: MK2.5, MK2.5s, MK3, MK3s and mods like Bontech extruder and 0.9° motors
• Firmware version printer Here some links to the Firmware hex files: FW3.9.1-BETA-3476 30 Juli 2020 FW3.9.1-BETA-3464 22 June 2020 FW3.9.1-BETA-3459 FW3.9.0 FW3.8.1

Feel free to write additional information you want to share.

I will try to update following table so everyone can see what results we got from the community.

Printer	PFW	25mm/s	50mm/s	75mm/s	100mm/s	125mm/s	User
MK3s	3.8.1	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Average
MK3s	3.9.0	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Average
MK3s	3.9.0+fix	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	Gxx Vxx Axx	50mm/s	Average

[Kachidoki2807]

I did a quick test, flashed the 3.9.1-BETA-3459 and printed the G-Code.

No, it's not a multi-color print, only the speed variations:

I had big gaps @125mm/s:

Less visible, but there are also tiny gaps at other speeds:

The best is 100mm/s I think:

About the vertical lines, the worst in arcs is 50mm/s, and for the straight lines (not parallel to X or Y) it is 75mm/s.

[DRracer]

@Kachidoki2807 hmmm, this is weird. I tried the same G-code a few days ago on MK3S and MK3 and none of them had gaps at all. I built the FW myself from https://github.com/wavexx/Prusa-Firmware/tree/la15_acc_test Fillament: random spools of Prusament PLA red.

I'll try the FW included in this issue on another MK3S just to make sure.

[Kachidoki2807]

Okay... I'll give a try with another filament on the same printer, and also on an another printer to see if this behaviour is consistent.

I have to mention that my nozzle must be pretty weared as I printed several kilos of face shields with it. I am waiting a replacement one, but in the meanwhile the print quality seems unaffected.

[DRracer]

@Kachidoki2807 just got similar gaps as you do (the top layers), running a clean FW build from @wavexx 's repo to isolate the problem (that build was ok for me on another set of printers). The gaps shouldn't be there anymore, something is wrong. My machine is relatively new, roughly 1kg of PLA went through (a bit of ASA and FLEX too).

[Kachidoki2807]

@DRracer I confirm, other filment on same printer or other filament on other printer, I got the same gaps.

I resliced the project from the .3mf and scaled down the Z axis by half to speed up the test. At the bottom is the first purple test, at the middle in brown it is on the same printer, and at the top in red it is on an MMU2S (Sorry for the bad quality picture).

[wavexx]

I can reproduce this!

[3d-gussner]

New fix from @wavexx has been released please try FW3.9.1-BETA-3464 22 June 2019

[Kachidoki2807]

FW 3.9.1-BETA-3464

Almost perfect:

[Kachidoki2807]

New fix from @wavexx has been released please try FW3.9.1-BETA-3464 22 June 2019

22 June 2020. ;-)

[mmuellerphoto]

OK ... So here my results: Zaribo Mk3s 320, Bondtech, Mosquito Magnum, Brass Nozzle, Redline PLA

FW	25mm/s	50mm/s	75mm/s	100mm/s	125mm/s	Comment
3.8.1-2872	G10 V04 A04	G10 V06 A06	G08 V07 A07	G07 V03 A03	G08 V02 A02	strange horizontal lines at lowest and higher speeds
3.9.0-4153	G10 V05 A04	G10 V07 A07	G07 V10 A09	G04 V08 A08	G02 V03 A03	strange horizontal lines at lowest and higher speeds; visible gaps at sharp corner
3.9.1-4179	G7 V04 A04	G8 V07 A07	G05 V09 A09	G06 V08 A08	G02 V02 A03	strange horizontal lines at lowest and higher speeds; visible gaps at sharp corner
3.9.1-4202	G5 V09 A09	G4 V09 A09	G03 V09 A09	G06 V08 A08	G02 V04 A03	strange horizontal lines at lowest and higher speeds; visible gaps at sharp corner at highest speed

Latest FW brought best results: sharp corners, best surface look. Did not play with temps, so different shades of color on the surface.

The gap / horizontal line on the surface with the 3.9.0 test is related to a filament change because of an empty spool. Same filament used afterwards.

[Kachidoki2807]

Hi,

@wavexx, @3d-gussner, can I consider this topic (gap in corners) solved? I am waiting that this topic is officially solved to switch my MK3s setup to a plated copper 0.6mm nozzle, then I will not be able to do more tests on this printer in the same conditions.

From my side, I am using the 3.9.1-BETA-3464 since three weeks now, I didn't noticed visible artifacts on the printed parts like I have on the other printer with the stock firmware at high speeds.

Thanks.

[3d-gussner]

Thanks for the update, we still investigate some rare issue, so it may take a bit until we have fw3.9.1 rc or final.