Extrusion fail

Edgars Batna

@crazyjane You might wanna remove the password to your Wifi from the post...

Also, post a sample gcode where this happens. Preferably just the layers or moves where it actually happens.

You might wanna try increasing E microsteps to 256 and see how that affects the behavior. The motor might need more juice tho.

CrazyJane

@edgars-batna
Thanks for your reply. I feel like a fool for not realising that the password was displayed - fixed.

I think I might have found the solution, I changed the slicing program from Simplify3D to CURA 4 and, so far, the parts that were failing are printing correctly, fingers crossed. I will do a detailed inspection of both G-code files to try to see what went wrong.

Your comments on the microstepping have left me slightly confused. I understood that M350 ... E16 I1was the recommended method for enabling microstepping interpolation, am I mistaken?

Veti

a titanium thermal break might be the wrong one for pla.

this can cause clogging. since you are not using a geared extruder, the extruder can be to weak to overcome this.

also where did you get Z397.1599 from? that seems like a very unusual number

Edgars Batna

@crazyjane said in Extrusion fail:

Your comments on the microstepping have left me slightly confused. I understood that M350 ... E16 I1was the recommended method for enabling microstepping interpolation, am I mistaken?

Depending on the slicer there will be completely different paths in the gcode. Problems are known on lower steps per mm due to rounding errors in combination with tiny extrusion segments. I know for a fact that Slic3r PE likes to sprinkle the gcode with tiny extrusion segments on curves which upsets the firmware. This then causes a problem like you describe on my printer with otherwise very similar steps per mm.

There are multiple things that I did to alleviate, but not solve this. One of the things included increasing E steps to 256. Are you using pressure advance by chance?

dc42

@edgars-batna said in Extrusion fail:

Problems are known on lower steps per mm due to rounding errors in combination with tiny extrusion segments.

That was corrected several firmware versions ago. However, I still recommend increasing microstepping if the extruder steps/mm would other be below about 400, especially if you use smaller than usual nozzles or layer heights.

Edgars Batna

@dc42 I'm aware of the fixes, but there's still an outstanding, reproducible issue as per my "PA issue?" thread which you already put on the todo list. Even if I set steps per mm to 256, there are cases when step pulses are wrong, but I don't want to repeat a 60 page thread again.

dc42

@edgars-batna said in Extrusion fail:

@dc42 I'm aware of the fixes, but there's still an outstanding, reproducible issue as per my "PA issue?" thread which you already put on the todo list. Even if I set steps per mm to 256, there are cases when step pulses are wrong, but I don't want to repeat a 60 page thread again.

Please can you give me a link to that thread, because I haven't found it using the forum search facility or by listing your posts.

Phaedrux

@dc42 I think it's this one
https://forum.duet3d.com/topic/8672/extruder-motors-skip-steps-with-pressure-advance-enabled/65

dc42

@phaedrux said in Extrusion fail:

@dc42 I think it's this one
https://forum.duet3d.com/topic/8672/extruder-motors-skip-steps-with-pressure-advance-enabled/65

If it's that one then it's still on my list to investigate as part of the development of firmware 2.03.

Edgars Batna

@dc42 Yes, it's that one.